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Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Dec. 29, 2018	Feb. 21, 2019	Jun. 29, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	LATTICE SEMICONDUCTOR CORP
Entity Central Index Key	0000855658
Document Type	10-K
Document Period End Date	Dec. 29, 2018
Amendment Flag	false
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--12-29
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		131,598,332
Entity Shell Company	false
Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Filer	No
Entity Public Float			$ 575,075,952

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 29, 2018	Dec. 30, 2017
Current assets:
Cash and cash equivalents	$ 119,051	$ 106,815
Short-term marketable securities	9,624	4,982
Accounts receivable, net of allowance for doubtful accounts	60,890	55,104
Inventories	67,096	79,903
Prepaid expenses and other current assets	27,762	16,567
Total current assets	284,423	263,371
Property and equipment, net	34,883	40,423
Intangible assets, net	21,325	51,308
Goodwill	267,514	267,514
Deferred income taxes	215	198
Other long-term assets	15,327	13,147
Total assets	623,687	635,961
Current liabilities:
Accounts payable and accrued expenses (includes restructuring)	51,763	54,405
Accrued payroll obligations	9,365	10,416
Current portion of long-term debt	8,290	1,508
Deferred revenue	0
Total current liabilities	69,418	83,647
Long-term debt	251,357	299,667
Other long-term liabilities	44,455	34,954
Total liabilities	365,230	418,268
Commitments and contingencies (Notes 13 and 19)
Stockholders' equity:
Preferred stock, $.01 par value, 10,000,000 shares authorized, none issued and outstanding	0	0
Common stock, $.01 par value, 300,000,000 shares authorized; 129,728,000 shares issued and outstanding as of December 29, 2018 and 123,895,000 shares issued and outstanding as of December 30, 2017	1,297	1,239
Additional paid-in capital	736,274	695,768
Accumulated deficit	(476,783)	(477,862)
Accumulated other comprehensive loss	(2,331)	(1,452)
Total stockholders' equity	258,457	217,693
Total liabilities and stockholders' equity	623,687	635,961
Product
Current liabilities:
Deferred revenue	0	17,250
Licensing and services
Current liabilities:
Deferred revenue	$ 0	$ 68

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Dec. 29, 2018	Dec. 30, 2017
Statement of Financial Position [Abstract]
Preferred stock, par value per share (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value per share (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	129,728,000	123,895,000
Common stock, shares outstanding	129,728,000	123,895,000

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Revenue:
Revenues	$ 398,799	$ 385,961	$ 427,054
Costs and expenses:
Research and development	82,449	103,357	117,518
Selling, general, and administrative	91,054	90,718	98,602
Amortization of acquired intangible assets	17,690	31,340	33,575
Restructuring charges	17,349	7,196	9,267
Acquisition related charges	1,531	3,781	6,305
Impairment of acquired intangible assets	12,486	32,431	7,866
Gain on sale of building	0	(4,624)	0
Total costs and expenses	401,919	433,581	453,753
Loss from operations	(3,120)	(47,620)	(26,699)
Interest expense	(20,600)	(18,807)	(20,327)
Other (expense) income, net	(249)	(3,286)	2,844
Loss before income taxes	(23,969)	(69,713)	(44,182)
Income tax expense	2,353	849	9,917
Net loss	$ (26,322)	$ (70,562)	$ (54,099)
Net loss per share, basic and diluted (in dollars per share)	$ (0.21)	$ (0.58)	$ (0.45)
Shares used in per share calculations, basic and diluted (in shares)	126,564	122,677	119,994
Product
Revenue:
Revenues	$ 380,468	$ 356,502	$ 390,704
Costs and expenses:
Cost of product revenue	179,101	164,657	179,983
Licensing and services
Revenue:
Revenues	18,331	29,459	36,350
Costs and expenses:
Cost of product revenue	$ 259	$ 4,725	$ 637

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net loss	$ (26,322)	$ (70,562)	$ (54,099)
Other comprehensive loss:
Unrealized gain (loss) related to marketable securities, net of tax	41	(73)	(172)
Reclassification adjustment for (gains) losses related to marketable securities included in other (expense) income, net	(18)	252	79
Translation adjustment, net of tax	(1,271)	2,620	(1,303)
Change in actuarial valuation of defined benefit pension	369	(95)	150
Comprehensive loss	$ (27,201)	$ (67,858)	$ (55,345)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands

Total

Common stock

Additional Paid-in capital

Accumulated deficit

Accumulated other comprehensive loss

Beginning balances (in shares) at Jan. 02, 2016

118,651

Beginning balances at Jan. 02, 2016

$ 305,520

$ 1,187

$ 660,089

$ (352,846)

$ (2,910)

Increase (Decrease) in Stockholders' Equity [Roll Forward]

Net loss

(54,099)

Unrealized loss related to marketable securities, net of tax

(172)

Recognized loss on redemption of marketable securities, previously unrealized

Translation adjustments, net of tax

(1,303)

Common stock issued in connection with the exercise of stock options, ESPP and vested RSUs (in shares)

2,994

Common stock issued in connection with the exercise of stock options, ESPP and vested RSUs, net of tax

4,042

$ 29

4,013

Stock-based compensation expense related to options, ESPP and RSUs

16,213

Defined benefit pension, net of actuarial valuation adjustments

150

Ending balances (in shares) at Dec. 31, 2016

121,645

Ending balances at Dec. 31, 2016

270,430

$ 1,216

680,315

(406,945)

(4,156)

Increase (Decrease) in Stockholders' Equity [Roll Forward]

Accounting method transition adjustment

^[1]

(355)

Net loss

(70,562)

Unrealized loss related to marketable securities, net of tax

(73)

Recognized loss on redemption of marketable securities, previously unrealized

252

Translation adjustments, net of tax

2,620

Common stock issued in connection with the exercise of stock options, ESPP and vested RSUs (in shares)

2,250

Common stock issued in connection with the exercise of stock options, ESPP and vested RSUs, net of tax

2,818

$ 23

2,795

Stock-based compensation expense related to options, ESPP and RSUs

^[2]

12,658

Defined benefit pension, net of actuarial valuation adjustments

$ (95)

(95)

Ending balances (in shares) at Dec. 30, 2017

123,895

Ending balances at Dec. 30, 2017

$ 217,693

$ 1,239

695,768

(477,862)

(1,452)

Increase (Decrease) in Stockholders' Equity [Roll Forward]

Accounting method transition adjustment

^[3]

27,401

Net loss

(26,322)

Unrealized loss related to marketable securities, net of tax

Recognized loss on redemption of marketable securities, previously unrealized

(18)

Translation adjustments, net of tax

(1,271)

Common stock issued in connection with the exercise of stock options, ESPP and vested RSUs (in shares)

5,833

Common stock issued in connection with the exercise of stock options, ESPP and vested RSUs, net of tax

26,918

$ 58

26,860

Stock-based compensation expense related to options, ESPP and RSUs

13,646

Defined benefit pension, net of actuarial valuation adjustments

$ 369

369

Ending balances (in shares) at Dec. 29, 2018

129,728

Ending balances at Dec. 29, 2018

$ 258,457

$ 1,297

$ 736,274

$ (476,783)

$ (2,331)

[1]	During the first quarter of fiscal 2017, we early adopted ASU 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory.This guidance is required to be applied on a modified retrospective basis through a cumulative-effect adjustment to the balance sheet as of the beginningof the fiscal year of adoption. As a result of this adoption, we recorded a nominal amount to Accumulated deficit, as detailed in the table above.
[2]	In the third quarter of fiscal 2017, in relation to the sale of 100% of the equity of our Hyderabad, India subsidiary and certain assets related to our SimplayLabs testing and certification business, certain stock compensation was accelerated due to a change of control agreement. As a result of this acceleration,the equity effect of stock compensation shown above includes approximately $0.1 million that was charged to restructuring expense as part of the June2017 Plan (see "Note 15 - Restructuring").
[3]	As of the beginning of fiscal 2018, we adopted ASC 606, Revenue from Contracts With Customers, using the modified retrospective transition method. Asa result of this adoption, we recorded a cumulative-effect adjustment to Accumulated deficit, as shown in the table above.

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) $ in Thousands	3 Months Ended
	Jun. 30, 2018 USD ($)
June 2017 Plan
Stock-based compensation expense related to options, ESPP and RSUs	$ 100

CONSOLIDATED STATEMENTS OF CASH FLOWS $ in Thousands	12 Months Ended
CONSOLIDATED STATEMENTS OF CASH FLOWS $ in Thousands	Dec. 29, 2018 USD ($)	Dec. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Cash flows from operating activities:
Net loss	$ (26,322)	$ (70,562)	$ (54,099)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	39,261	57,861	61,806
Impairment of acquired intangible assets	12,486	32,431	7,866
Amortization of debt issuance costs and discount	2,230	1,982	1,350
Change in deferred income tax provision	(96)	(154)	90
(Gain) loss on sale or maturity of marketable securities	(18)	252	79
Gain on forward contracts	(53)	(77)	(184)
Stock-based compensation expense	13,646	12,543	16,213
(Gain) loss on disposal of fixed assets	(178)	(75)	597
Gain on sale of building	0	(4,624)	0
Loss (gain) on sale of assets and business units	0	1,496	(2,646)
Impairment of cost-method investment	266	1,761	1,459
Changes in assets and liabilities:
Accounts receivable, net	(3,978)	44,613	(11,419)
Inventories	13,177	(902)	(3,272)
Prepaid expenses and other assets	(11,667)	889	(2,270)
Accounts payable and accrued expenses (includes restructuring)	13,325	(23,588)	8,338
Accrued payroll obligations	(1,051)	726	402
Income taxes payable	498	(556)	3,216
Net cash provided by operating activities	51,458	38,514	41,734
Cash flows from investing activities:
Proceeds from sales of and maturities of short-term marketable securities	5,000	12,689	14,897
Purchase of marketable securities	(9,603)	(7,420)	(7,490)
Proceeds from sale of building	0	7,895	0
Cash paid for costs of sale of building	0	(1,004)	0
Capital expenditures	(8,384)	(12,855)	(16,717)
Proceeds from sale of assets and business units, net of cash sold	0	967	1,972
Repayment received on short-term loan to cost-method investee	0	2,000	0
Short-term loan to cost-method investee	0	(2,000)	0
Cash paid for a cost-method investment	0	0	(1,000)
Cash paid for software licenses	(8,123)	(8,532)	(9,035)
Net cash used in investing activities	(21,110)	(8,260)	(17,373)
Cash flows from financing activities:
Restricted stock unit tax withholdings	(2,370)	(3,267)	(3,565)
Proceeds from issuance of common stock	29,288	6,085	7,607
Repayment of debt	(43,759)	(35,429)	(5,154)
Net cash used in financing activities	(16,841)	(32,611)	(1,112)
Effect of exchange rate change on cash	(1,271)	2,620	(1,303)
Net increase in cash and cash equivalents	12,236	263	21,946
Beginning cash and cash equivalents	106,815	106,552	84,606
Ending cash and cash equivalents	119,051	106,815	106,552
Supplemental cash flow information:
Change in unrealized (gain) loss related to marketable securities, net of tax, included in Accumulated other comprehensive loss	(41)	73	172
Income taxes paid, net of refunds	3,054	2,387	9,359
Interest paid	18,607	20,649	18,159
Accrued purchases of property and equipment	110	588	1,028
Note receivable resulting from sale of assets and business units	0	3,050	0
Product
Changes in assets and liabilities:
Deferred revenue	0	(15,007)	14,391
Licensing and services
Changes in assets and liabilities:
Deferred revenue	$ (68)	$ (495)	$ (183)

Nature of Operations and Significant Accounting Policies

12 Months Ended

Dec. 29, 2018

Accounting Policies [Abstract]

Nature of Operations and Significant Accounting Policies

Nature of Operations

Lattice Semiconductor and its subsidiaries (“Lattice,” the “Company,” “we,” “us,” or “our”) is a Delaware corporation that develops semiconductor technologies that we monetize through products, solutions, design services, and licenses. We engage in smart connectivity, control, and compute solutions, providing intellectual property ("IP") and low-power, small form-factor programmable logic devices that enable global customers to quickly and easily develop innovative, smart, and connected products. We help their products become more aware, interact more intelligently, and make better and faster connections. In an increasingly intense global technology market, we help our customers get their products to market faster than their competitors. Our broad end-market exposure extends from mobile devices and consumer electronics to industrial and automotive equipment, communications and computing infrastructure, and licensing and services. Lattice was founded in 1983 and is headquartered in Hillsboro, Oregon.

We do not manufacture our own silicon wafers. We maintain strategic relationships with large, established semiconductor foundries located in Asia to source our finished silicon wafers. In addition, all of our assembly operations and most of our test and logistics operations are performed by outside suppliers located in Asia. We perform certain test operations and reliability and quality assurance processes internally.

We place substantial emphasis on new product development and believe that continued investment in this area is required to maintain and improve our competitive position. Our product development activities emphasize new proprietary products, advanced packaging, enhancement of existing products and process technologies, and improvement of software development tools. Research and development activities occur primarily in: Hillsboro, Oregon; San Jose, California; Shanghai, China; and Muntinlupa City, Philippines.

Fiscal Reporting Period

We report based on a 52 or 53-week fiscal year ending on the Saturday closest to December 31. Our fiscal 2018, 2017, and 2016 were 52-week years that ended December 29, 2018, December 30, 2017, and December 31, 2016 respectively. Our fiscal 2019 will be a 52-week year and will end on December 28, 2019. All references to quarterly or yearly financial results are references to the results for the relevant fiscal period.

Principles of Consolidation

The accompanying Consolidated Financial Statements include the accounts of Lattice and its subsidiaries after the elimination of all intercompany balances and transactions.

Use of Estimates

The preparation of financial statements in conformity with U.S. generally accepted accounting principles ("U.S. GAAP") requires management to make estimates and assumptions that affect the reported amounts and classification of assets, such as marketable securities, accounts receivable, contract assets (included in prepaid expenses and other current assets), inventory, goodwill (including the assessment of reporting units), intangible assets, current and deferred income taxes, accrued liabilities (including restructuring charges and bonus arrangements), disclosure of contingent assets and liabilities at the date of the financial statements, amounts used in acquisition valuations and purchase accounting, impairment assessments, the fair value of equity awards, and the reported amounts of product revenue, licensing and services revenue, and expenses during the fiscal periods presented. Because of the uncertainty inherent in these matters, actual results could differ from those estimates.

Cash Equivalents and Marketable Securities

We consider all investments that are readily convertible into cash and that have original maturities of three months or less to be cash equivalents. Cash equivalents consist primarily of highly liquid investments in time deposits or money market accounts and are carried at cost. We account for marketable securities as available-for-sale investments, as defined by U.S. GAAP, and record unrealized gains or losses to Accumulated other comprehensive loss on our Consolidated Balance Sheets, unless losses are considered other than temporary, in which case, those are recorded directly to the Consolidated Statements of Operations and Consolidated Statements of Comprehensive Loss. Deposits with financial institutions at times exceed Federal Deposit Insurance Corporation insurance limits.

Fair Value of Financial Instruments

We invest in various financial instruments, which may include corporate and government bonds, notes, and commercial paper. We value these instruments at their fair value and monitor our portfolio for impairment on a periodic basis. In the event that the carrying value of an investment exceeds its fair value and the decline in value is determined to be other than temporary, we would record an impairment charge and establish a new carrying value. We assess other-than-temporary impairment of marketable securities in accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) 820, “Fair Value Measurements.” The framework under the provisions of ASC 820 establishes three levels of inputs that may be used to measure fair value. Each level of input has different levels of subjectivity and difficulty involved in determining fair value.

Level 1 instruments generally represent quoted prices for identical assets or liabilities in active markets. Therefore, determining fair value for Level 1 instruments generally does not require significant management judgment, and the estimation is not difficult. Our Level 1 instruments consist of U.S. Government agency obligations, corporate notes and bonds, and commercial paper that are traded in active markets and are classified as Short-term marketable securities on our Consolidated Balance Sheets.

Level 2 instruments include inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities, quoted prices for identical instruments in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Our Level 2 instruments consist of foreign currency exchange contracts, entered into to hedge against fluctuation in the Japanese yen.

Level 3 instruments include unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. As a result, the determination of fair value for Level 3 instruments requires significant management judgment and subjectivity. We did not have any Level 3 instruments during the periods presented.

Foreign Exchange and Translation of Foreign Currencies

While our revenues and the majority of our expenses are denominated in U.S. dollars, we have international subsidiaries and branch operations that conduct some transactions in foreign currencies, and we collect an annual Japanese consumption tax refund in yen. Gains or losses from foreign exchange rate fluctuations on balances denominated in foreign currencies are reflected in Other (expense) income, net. Realized gains or losses on foreign currency transactions were not significant for the periods presented.

We translate accounts denominated in foreign currencies in accordance with ASC 830, “Foreign Currency Matters,” using the current rate method under which asset and liability accounts are translated at the current rate, while stockholders' equity accounts are translated at the appropriate historical rates, and revenue and expense accounts are translated at average monthly exchange rates. Translation adjustments related to the consolidation of foreign subsidiary financial statements are reflected in Accumulated other comprehensive loss in Stockholders' equity (See our Consolidated Statements of Stockholders' Equity).

Derivative Financial Instruments

We mitigate foreign currency exchange rate risk by entering into foreign currency forward exchange contracts, details of which are presented in the following table:



	December 29, 2018		December 30, 2017
Total cost of contracts for Japanese yen (in thousands)	$	1,955	$	2,204
Number of contracts	2		2
Settlement month	June 2019		June 2018

Although these hedges mitigate our foreign currency exchange rate exposure from an economic perspective, they were not designated as "effective" hedges under U.S. GAAP and as such are adjusted to fair value through Other (expense) income, net, with gains of approximately $0.1 million for each of the years ended December 29, 2018 and December 30, 2017. We do not hold or issue derivative financial instruments for trading or speculative purposes.

Concentration Risk

Potential exposure to concentration risk may impact revenue, trade receivables, marketable securities, and supply of wafers for our new products.

Customer concentration risk may impact revenue. The percentage of total revenue attributable to our top five identified end customers and largest identified end customer is presented in the following table:



	Year Ended
	December 29, 2018		December 30, 2017		December 31, 2016
Revenue attributable to top five end customers	18	%	26	%	27	%
Revenue attributable to largest end customer	6.1	%	7.3	%	9.9	%

No end customer accounted for more than 10% of total revenue during these periods. We did not have enough information to assign end customers to approximately $14.1 million of revenue recognized for fiscal 2018 on shipments to distributors that have not sold through to end customers.

Distributors have historically accounted for a significant portion of our total revenue. Our two largest distributor groups, Arrow Electronics, Inc. ("Arrow") and the Weikeng Group ("Weikeng"), each account for substantial portions of our total revenue and our net trade receivables. Revenue attributable to distributors as a percentage of total revenue is presented in the following table:



	Year Ended
	December 29, 2018		December 30, 2017		December 31, 2016
Arrow Electronics Inc.	29	%	24	%	24	%
Weikeng Group	25		27		22
All others	29		26		27
Revenue attributable to distributors*	83	%	77	%	73	%



*	During the first quarter of 2018, we updated our channel categories to group all forms of distribution into a single channel. Prior periods have been reclassified to match the current period presentation.

At December 29, 2018 and December 30, 2017, Arrow accounted for 41% and 66%, respectively, and Weikeng accounted for 23% and 0%, respectively, of net trade receivables. No other distributor group or end customer accounted for more than 10% of net trade receivables at these dates.

Concentration of credit risk with respect to trade receivables is mitigated by our credit and collection process including active management of collections, credit limits, routine credit evaluations for essentially all customers, and secure transactions with letters of credit or advance payments where appropriate. We regularly review our allowance for doubtful accounts and the aging of our accounts receivable.

Accounts receivable do not bear interest and are shown net of allowances for doubtful accounts of $0.2 million and $9.4 million at December 29, 2018 and December 30, 2017, respectively. The allowance for doubtful accounts reflects our best estimate of probable losses inherent in the accounts receivable balance. We determine the allowance based on assessment of known troubled accounts, analysis of the aging of our accounts receivable, historical experience, management judgment, and other currently available evidence. We write off accounts receivable against the allowance when we determine a balance is uncollectible and no longer actively pursue collection of the receivable. During fiscal 2018, we wrote off $9.0 million of accounts receivable from a bankrupt distributor group. This write off had no impact on Accounts Receivable in fiscal 2018, as we had recorded a full allowance against our accounts receivable, net of deferred revenue, from the bankrupt distributor group in fiscal 2016, resulting in an increase in allowance for doubtful accounts of $9.0 million and bad debt expense of $7.5 million in that fiscal year. Bad debt expense was negligible for both fiscal 2018 and 2017.

We place our investments primarily through one financial institution and mitigate the concentration of credit risk by limiting the maximum portion of the investment portfolio which may be invested in any one instrument. Our investment policy defines approved credit ratings for investment securities. Investments on-hand in marketable securities consisted primarily of money market instruments and U.S. government agency obligations. See "Note 4 - Marketable Securities" for a discussion of the liquidity attributes of our marketable securities.

We rely on a limited number of foundries for our wafer purchases including Fujitsu Limited, Seiko Epson Corporation, Taiwan Semiconductor Manufacturing Company, Ltd, and United Microelectronics Corporation. We seek to mitigate the concentration of supply risk by establishing, maintaining and managing multiple foundry relationships; however, certain of our products are sourced from a single foundry and changing from one foundry to another can have a significant cost, among other factors.

Inventories and Cost of Product Revenue

Inventories are recorded at the lower of average cost determined on a first-in-first-out basis or market. We establish provisions for inventory if it is obsolete or we hold quantities which are in excess of projected customer demand. The creation of such provisions results in a write-down of inventory to net realizable value and a charge to cost of product revenue. Shipping and handling costs are included in Cost of product revenue in our Consolidated Statements of Operations.

Property and Equipment

Property and equipment are stated at cost. Depreciation and amortization are computed using the straight-line method for financial reporting purposes over the estimated useful lives of the related assets, generally three to five years for equipment and software, one to three years for tooling, and thirty years for buildings and building space. Leasehold improvements are amortized over the shorter of the non-cancelable lease term or the estimated useful life of the assets. Upon disposal of property and equipment, the accounts are relieved of the costs and related accumulated depreciation and amortization, and resulting gains or losses are reflected in the Consolidated Statements of Operations for recognized gains and losses, or in the Consolidated Balance Sheets for deferred gains and losses. Repair and maintenance costs are expensed as incurred.

Equity Investments in Privately Held Companies

Equity investments in privately held companies that we are not required to consolidate are accounted for under the cost method, as assessed under ASC 325-20, "Cost Method Investments." These investments are reviewed on a quarterly basis to determine if their values have been impaired and adjustments are recorded as necessary. We assess the potential impairment of these investments by applying a fair value analysis using a revenue multiple approach. Declines in value that are judged to be other-than-temporary are reported in Other (expense) income, net in the accompanying Consolidated Statements of Operations with a commensurate decrease in the carrying value of the investment (see "Note 11 - Cost Method Investment and Collaborative Arrangement"). Upon disposition of these investments, the specific identification method is used to determine the cost basis in computing realized gains or losses.

Impairment of Long-Lived Assets

Long-lived assets, including amortizable intangible assets, are carried on our financial statements based on their cost less accumulated depreciation or amortization. We monitor the carrying value of our long-lived assets for potential impairment and test the recoverability of such assets annually during the fourth quarter and whenever events or changes in circumstances indicate that their carrying amounts may not be recoverable. These events or changes in circumstances, including management decisions pertaining to such assets, are referred to as impairment indicators. If an impairment indicator occurs, we perform a test of recoverability by comparing the carrying value of the asset group to its undiscounted expected future cash flows. If the carrying values are in excess of undiscounted expected future cash flows, we measure any impairment by comparing the fair value of the asset group to its carrying value. Fair value is generally determined by considering (i) internally developed discounted projected cash flow analysis of the asset group; (ii) actual third-party valuations; and/or (iii) information available regarding the current market for similar asset groups. If the fair value of the asset group is determined to be less than the carrying amount of the asset group, an impairment in the amount of the difference is recorded in the period that the impairment indicator occurs and is included in our Consolidated Statements of Operations. Estimating future cash flows requires significant judgment and projections may vary from the cash flows eventually realized, which could impact our ability to accurately assess whether an asset has been impaired. The results of our assessments are detailed in "Note 10 - Impairment of Acquired Intangible Assets."

Valuation of Goodwill

Goodwill is an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. We review goodwill for impairment annually during the fourth quarter and whenever events or changes in circumstances indicate the carrying value of goodwill may not be recoverable. When evaluating whether goodwill is impaired, we make a qualitative assessment to determine if it is more likely than not that the reporting unit's fair value is less than the carrying amount. If the qualitative assessment determines that it is more likely than not that the fair value is less than the carrying amount, the fair value of the reporting unit is compared with its carrying value (including goodwill). If the fair value of the reporting unit is less than its carrying value, then goodwill impairment exists for the reporting unit. The impairment loss, if any, is recognized for the amount by which the carrying value exceeds the fair value. If the fair value of the reporting unit exceeds its carrying value, no further impairment analysis is needed. For purposes of testing goodwill for impairment, we currently operate as a single reporting unit: the core Lattice ("Core") business, which includes intellectual property and semiconductor devices. The results of our assessments are detailed in "Note 8 - Discontinuation of Business Unit, Sales of Assets and Business Units, and Goodwill."

Leases

The following describes our lease policy during fiscal 2018. In fiscal 2019, we will adopt ASU 2016-02, Leases (Topic 842). See "New Accounting Pronouncements" later in this Note 1 for a discussion of the impact of adoption on our accounting for leases.

We lease office space and classify our leases as either operating or capital lease arrangements in accordance with the criteria of ASC 840, “Leases.” Certain of our office space operating leases contain provisions under which monthly rent escalates over time and certain leases may also contain provisions for reimbursement of a specified amount of leasehold improvements. When lease agreements contain escalating rent clauses, we recognize expense on a straight-line basis over the term of the lease. When lease agreements provide allowances for leasehold improvements, we capitalize the leasehold improvement assets and amortize them on a straight-line basis over the lesser of the lease term or the estimated useful life of the asset, and reduce rent expense on a straight-line basis over the term of the lease by the amount of the asset capitalized.

Restructuring Charges

Expenses associated with exit or disposal activities are recognized when incurred under ASC 420, “Exit or Disposal Cost Obligations,” for everything but severance. When leased facilities are vacated, an amount equal to the total future lease obligations from the date of vacating the premises through the expiration of the lease, net of any future sublease income, is recorded as a part of restructuring charges. Expenses from other exit or disposal activities, including the cancellation of software contracts and engineering tools or the abandonment of long lived assets, is recorded as a part of restructuring charges. Because we have a history of paying severance benefits, the cost of severance benefits associated with a restructuring plan is recorded when such costs are probable and the amount can be reasonably estimated in accordance with ASC 712, “Compensation - Nonretirement Postemployment Benefits.”

Research and Development

Research and development expenses include costs for compensation and benefits, development masks, engineering wafers, depreciation, licenses, and outside engineering services. These expenditures are for the design of new products, intellectual property cores, processes, packaging, and software to support new products. Research and development costs are expensed as incurred.

Accounting for Income Taxes

Our provision for income tax is comprised of our current tax liability and changes in deferred tax assets and liabilities. Deferred tax assets and liabilities are recognized for the expected tax consequences of temporary differences between the tax bases of assets and liabilities and their reported amounts in the financial statements using enacted tax rates and laws that will be in effect when the difference is expected to reverse. Valuation allowances are provided to reduce deferred tax assets to an amount that in management’s judgment is more-likely-than-not to be recoverable against future taxable income. The determination of a valuation allowance and when it should be released requires complex judgment.

In assessing the ability to realize deferred tax assets, we evaluate both positive and negative evidence that may exist and consider whether it is more-likely-than-not that some portion or all of the deferred tax assets will be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. Any adjustment to the net deferred tax asset valuation allowance is recorded in the Consolidated Statements of Operations for the period that the adjustment is determined to be required.

Our income tax calculations are based on application of the respective U.S. federal, state or foreign tax law. Our tax filings, however, are subject to audit by the relevant tax authorities. Accordingly, we recognize tax liabilities based upon our estimate of whether, and the extent to which, additional taxes will be due when such estimates are more-likely-than-not to be sustained. An uncertain income tax position will not be recognized if it has less than a 50% likelihood of being sustained. To the extent the final tax liabilities are different than the amounts originally accrued, the increases or decreases as well as any interest or penalties are recorded as income tax expense or benefit in the Consolidated Statements of Operations.

U.S. tax reform required a deemed repatriation of foreign earnings as of December 30, 2017 and no future U.S. taxes will be due on these earnings because of enactment of a 100% dividends received deduction. Foreign earnings may be subject to withholding taxes in local jurisdictions if they are distributed and repatriated to Lattice in the United States.

Stock-Based Compensation

We use the Black-Scholes option pricing model to estimate the fair value of substantially all share-based awards consistent with the provisions of ASC 718, “Compensation - Stock Compensation.” Option pricing models, including the Black-Scholes model, require the use of input assumptions, including expected volatility, expected term, expected dividend rate, and expected risk-free rate of return. The assumptions for expected volatility and expected term most significantly affect the grant date fair value.

We have also granted stock options and RSUs with a market condition to certain executives. We determined and fixed the fair value of the awards with a market condition using a lattice-based option-pricing model. The valuation of these awards incorporated a Monte-Carlo simulation, and considered the likelihood that we would achieve the market condition. The awards with a market condition generally have a two- or three-year vesting period and vest between 0% and 250% of the target amount, based on the Company's relative Total Shareholder Return ("TSR") when compared to the TSR of a component of companies of the PHLX Semiconductor Sector Index over the measurement period. TSR is a measure of stock price appreciation plus dividends paid, if any, in the performance period. We have also granted RSUs with a performance condition to our President and Chief Executive Officer, which will vest and become payable based upon the Company’s generating specified “adjusted” EBITDA levels on a trailing four-quarter basis in any two consecutive trailing four-quarter periods. We valued the RSUs with a performance condition using the market price on the day of grant.

New Accounting Pronouncements

Recently Issued Accounting Standards

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), which requires the recognition of assets and liabilities arising from lease transactions on the balance sheet and will also require significant additional disclosures about the amount, timing, and uncertainty of cash flows from leases. Substantially all leases, including current operating leases, will be recognized by lessees on their balance sheet as a lease asset for its right to use the underlying asset and a lease liability for the corresponding lease obligation. For public business entities, the standard is effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. We will adopt this standard on its effective date. ASU 2016-02 initially required entities to adopt the standard using a modified retrospective transition method. In July 2018, the FASB issued certain updates including ASU 2018-11, Leases (Topic 842): Targeted Improvements, which provide optional transition practical expedients allowing companies to adopt the new standard with a cumulative effect adjustment as of the beginning of the year of adoption with prior year comparative financial information and disclosures remaining as previously reported. We plan to elect this optional practical expedient, and do not expect a material adjustment to beginning retained earnings.

We evaluated the transition and presentation approaches available as well as the impact of the new guidance on our consolidated financial statements and related disclosures, including the increase in the assets and liabilities on our balance sheet, and the impact on our current lease portfolio from both a lessor and lessee perspective. To facilitate this, we utilized a comprehensive approach to review our lease portfolio, as well as assessed system requirements and control implications. We expect to elect the ‘package of practical expedients’ that would allow us to carryforward our historical lease classifications, not reassess historical contracts to determine if they contain leases, and not reassess the initial direct costs for any existing leases. We also expect to elect further practical expedients that allow companies to account for leases based on the class of the underlying asset and not separate lease and non-lease components, and to not recognize right-of-use assets and lease liabilities for leases whose term to maturity upon inception is less than 12 months. Adoption of ASU 2016-02 is expected to result in the recognition of additional right-of-use assets and lease liabilities for operating leases in the range of $25 million to $30 million. We do not expect the new standard to have a material impact on our consolidated income statement, cash flows, or liquidity measures.

In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, which improves the financial reporting of hedging relationships to better portray the economic results of an entity’s risk management activities in its financial statements and simplifies the application of the hedge accounting guidance. This standard is effective for annual periods beginning after December 15, 2018, including interim periods within those annual periods, with early adoption permitted. We do not expect the adoption of this accounting standard update to have a material impact on our consolidated financial statements and related disclosures.

In February 2018, the FASB issued ASU 2018-02, Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. The new guidance allows an entity to reclassify the income tax effects of the Public Law 115-97 "An Act to Provide Reconciliation Pursuant to Titles II and V of the Concurrent Resolution on the Budget for Fiscal Year 2018", commonly known as the Tax Cuts and Job Act of 2017 (the "2017 Tax Act") on items within accumulated other comprehensive income/(loss) to accumulated deficit. This new guidance is effective for fiscal years beginning after December 15, 2018, with early adoption permitted. The new standard must be adopted retrospectively to each period in which a taxpayer recognizes the effect of the change in the U.S. federal corporate income tax rate from the 2017 Tax Act. We are currently assessing the impact of ASU 2018-02 on our consolidated financial statements and related disclosures.

In June 2018, the FASB issued ASU No. 2018-07, Compensation-Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting, which largely aligns the measurement and classification guidance for share-based payments to nonemployees with the guidance for share-based payments to employees. The ASU also clarifies that any share-based payment issued to a customer should be evaluated under ASC 606, Revenue from Contracts with Customers. The ASU requires a modified retrospective transition approach. This new guidance is effective for fiscal years beginning after December 15, 2018, including interim periods within that fiscal year. We do not expect the adoption of this accounting standard update to have a material impact on our consolidated financial statements and related disclosures.

In August 2018, the FASB issued ASU 2018-15, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40), which clarifies the accounting for implementation costs in cloud computing arrangements. This guidance is effective for interim and annual reporting periods beginning after December 15, 2019, and early adoption is permitted. We are currently assessing the impact of ASU 2018-15 on our consolidated financial statements and related disclosures.

Revenue from Contracts with Customers

12 Months Ended

Dec. 29, 2018

Revenue from Contract with Customer [Abstract]

Revenue from Contracts with Customers

We adopted ASC 606 effective on December 31, 2017, the first day of our 2018 fiscal year, using the modified retrospective method. Under the guidance in effect prior to the adoption of ASC 606, we deferred the recognition of revenue and the cost of revenue from certain sales until the distributors of our products reported that they had sold the products to their customers, at which point the selling price of these products became fixed and determinable (known as “sell-through” revenue recognition). Under ASC 606, we recognize revenue on sales to all distributors when control of the products transfers to the distributors, and we estimate the transaction price to which we ultimately expect to be entitled. Under ASC 606, we will also recognize certain licensing revenues that were not recognizable under previous GAAP due to the fixed and determinable revenue recognition criteria not being met. Under the modified retrospective transition method, we have not restated any prior financial statements presented. As a result of this adoption, we revised our accounting policy for revenue recognition as detailed below.

We recognize revenue under the core principle of depicting the transfer of control to our customers in an amount reflecting the consideration we expect to be entitled. In order to achieve that core principle, we apply the following five step approach, as further described below: (1) identify the contract with a customer, (2) identify the performance obligations in the contract, (3) determine the transaction price, (4) allocate the transaction price to each performance obligation in the contract, and (5) recognize revenue when applicable performance obligations are satisfied.

Product Revenue

Identify the contract with a customer - Our product revenues consist of sales to original equipment manufacturers, or OEMs, and distributors. We consider customer purchase orders, which in some cases are governed by master sales agreements, to be the contracts with a customer. In certain cases we consider firm forecasts that are agreed to by both us and the customer to be contracts. For sales to distributors, we have concluded that our contracts are with the distributor, rather than with the distributor’s end customer, as we hold a contract bearing enforceable rights and obligations only with the distributor. As part of our consideration of the contract, we evaluate certain factors including the customer’s ability to pay (or credit risk).

Identify the performance obligations in the contract - For each contract, we consider our promise to transfer each distinct product to be the identified performance obligations.

Determine the transaction price - In determining the transaction price, we evaluate whether the set contract price is subject to refund or adjustment to determine the net consideration to which we expect to be entitled. As our standard payment terms are less than one year, we have elected to apply the practical expedient to not assess whether a contract has a significant financing component.

Sales to most distributors are made under terms allowing certain price adjustments and limited rights of return of our products held in their inventory or upon sale to their end customers. Revenue from sales to distributors is recognized upon the transfer of control to the distributor, which generally occurs upon shipment of product to the distributor. Frequently, distributors need to sell at a price lower than the standard distribution price in order to win business. At the time the distributor invoices its customer or soon thereafter, the distributor submits a “ship and debit” price adjustment claim to us to adjust the distributor’s cost from the standard price to the pre-approved lower price. After we verify that the claim was pre-approved, we issue a credit memo to the distributor for the ship and debit claim. In determining the transaction price, we consider ship and debit price adjustments to be variable consideration. Such price adjustments are estimated using the expected value method based on an analysis of historical ship and debit claims, at the distributor and product level, over a period of time considered adequate to account for current pricing and business trends, typically 6 months. Any differences between the estimated consideration and the actual amount received from the customer is recorded in the period that the actual consideration becomes known. Most of our distributors are entitled to limited rights of return, referred to as stock rotation, not to exceed 5% of billings, net of returns and ship and debit price adjustments. Stock rotation reserves are based on historical return rates and recorded as a reduction to revenue with a corresponding reduction to cost of goods sold for the estimated cost of inventory that we expect to be returned.

Sales to OEMs and certain distributors are made under terms that do not include rights of return or price concessions after we ship the product. Accordingly, the transaction price equals the invoice price and there is no variable consideration.

Allocate the transaction price to each performance obligation in the contract - Because our product revenue contracts generally include the delivery of a certain quantity of semiconductors as the single performance obligation, we do not allocate revenue across distinct performance obligations. However, we frequently receive orders for products to be delivered over multiple dates that may extend across several reporting periods. We invoice for each delivery upon shipment and recognize revenues for each distinct product delivered, assuming transfer of control has occurred. Payment term for invoices are generally 30 to 60 days.

Recognize revenue when applicable performance obligations are satisfied - Revenue is recognized when control of the product is transferred to the customer (i.e., when our performance obligation is satisfied), which typically occurs at shipment. In determining whether control has transferred, we also consider if there is a present right to payment and legal title, along with whether the risks and rewards of ownership have transferred to the customer. We have certain vendor-managed inventory arrangements with certain OEM customers whereby we ship product into an inventory hub location but for which control does not transfer until the customer consumes the inventory. In such cases, we recognize revenue upon customer consumption.

Licensing and Services Revenue

Identify the contract with a customer - Our Licensing and services revenue is comprised of revenue from our intellectual property ("IP") core licensing activity, patent monetization activities, design services, and royalty and adopter fee revenue from our standards activities. These activities are complementary to our product sales and help us to monetize our IP associated with our technology and standards. We consider licensing arrangements with our customers to be the contract.

Identify the performance obligations in the contract - For each contract, we consider the promise to deliver a license that grants the customer the right to use the IP, as well as any professional services provided under the contract, as distinct performance obligations.

Determine the transaction price - Our HDMI and MHL standards revenue, as well as certain IP licenses, include variable consideration in the form of usage-based royalties. We apply the provisions of ASC 606 in accounting for these types of arrangements, whereby we do not include estimated royalties in the transaction price at the origination of the contract but rather recognize royalty revenue as usage occurs.

HDMI royalty revenue is determined by a contractual allocation formula agreed to by the Founders of the HDMI consortium. The contractual allocation formula is subject to periodic adjustment, generally every three years. The most recent royalty sharing formula covered the period from January 1, 2014 through December 31, 2016, and an interim agreement covering the period from January 1, 2017 through December 31, 2017 was signed in the second quarter of fiscal 2018. However, a new agreement covering the period beginning January 1, 2018 is yet to be signed. While a new royalty sharing agreement is being negotiated with the other Founders of the HDMI consortium, the HDMI agent is unable to distribute the majority of the royalties collected to the Founders. We are recording revenue based on our estimated share of the royalties, which we determine using an analytical model that combines historical and forecasted collection trends with our expected share of those collections. This estimate will be adjusted once the Founders finalize the agreement for the period beginning January 1, 2018.

Allocate the transaction price to each performance obligation in the contract - For contracts that include multiple performance obligations (most commonly those that include licenses and professional services, but which also may include inventory), we allocate revenue to each performance obligation based on the best estimate of the standalone selling price of each obligation. We do not believe that the judgments regarding the allocation of revenue on licensing arrangements are material to our financial statements.

Recognize revenue when applicable performance obligations are satisfied - We recognize license revenue at the point in time that control of the license transfers to the customer, which is generally upon delivery. We recognize professional service revenue as we perform the services. Royalty revenues are recognized as customers sell products that include our IP and are legally obligated to remit royalties to us. We receive payments from customers based on contractual billing schedules. Accounts receivable are recorded when the right to consideration becomes unconditional. Payment terms on invoiced amounts are typically 30 days.

Impact on Financial Statements

We adopted ASC 606 on December 31, 2017, the first day of our 2018 fiscal year, using the modified retrospective method. Under this transition method, we applied the provisions of the new standard to all open customer contracts as of the date of adoption and recorded the cumulative effect of adoption to Accumulated deficit on December 31, 2017. We have not restated any prior financial statements presented. ASC 606 requires us to disclose the effect of adoption on each financial statement line item in the current reporting period during 2018 as compared to the revenue recognition accounting standard that was in effect in 2017, and an explanation of the reasons for significant changes. Such information is as follows:



Condensed Consolidated Statement of Operations
	Year ended December 29, 2018
(In thousands, except per share data)	As reported under new standard		Adjustments		Pro forma as if previous standard was in effect
Product revenue	380,468		(14,098	)	366,370
Licensing and services revenue	18,331		(1,478	)	16,853
Cost of product revenue	179,101		(6,399	)	172,702
Net loss	(26,322	)	(9,177	)	(35,499	)

Net loss per share, basic and diluted	(0.21	)	(0.07	)	(0.28	)



Condensed Consolidated Balance Sheets
	As of December 29, 2018
(In thousands)	As reported under new standard		Adjustments		Pro forma as if previous standard was in effect
Accounts receivable, net of allowance for doubtful accounts	60,890		6,600		67,490
Inventories	67,096		78		67,174
Prepaid expenses and other current assets	27,762		(9,775	)	17,987
Total assets	623,687		(3,097	)	620,590

Accounts payable and accrued expenses (includes restructuring)	51,763		(1,156	)	50,607
Deferred income and allowances on sales to distributors	—		34,637		34,637
Accumulated deficit	(476,783	)	(36,578	)	(513,361	)
Total liabilities and stockholders' equity	623,687		(3,097	)	620,590



Condensed Consolidated Statement of Cash Flows
	Year ended December 29, 2018
(In thousands)	As reported under new standard		Adjustments		Pro forma as if previous standard was in effect
Cash flows from operating activities:
Net loss	(26,322	)	(9,177	)	(35,499	)
Accounts receivable, net	(3,978	)	(8,408	)	(12,386	)
Inventories	13,177		(448	)	12,729
Prepaid expenses and other assets	(11,667	)	2,260		(9,407	)
Accounts payable and accrued expenses (includes restructuring)	13,325		(1,614	)	11,711
Deferred income and allowances on sales to distributors	—		17,387		17,387

The significant impacts of the new standard were to accelerate the recognition of revenues on both sales to certain distributors and certain licensing activities. As a result of adopting this standard, we recorded a cumulative effect adjustment of $27.4 million as a reduction to Accumulated deficit on December 31, 2017, resulting primarily from a net $20.2 million of previously deferred distributor revenues and costs and $6.6 million of previously unrecognized licensing revenues.

Other Matters

We generally provide an assurance warranty that our products will substantially conform to the published specifications for twelve months from the date of shipment. In some case the warranty period may be longer than twelve months. We do not separately price or sell the assurance warranty. Our liability is limited to either a credit equal to the purchase price or replacement of the defective part. Returns under warranty have historically been immaterial. As such, we do not record a specific warranty reserve or consider activities related to such warranty, if any, to be a separate performance obligation.

Under the practical expedient provided by ASC 340, we generally expense sales commissions when incurred because the amortization period would have been less than one year. We record these costs within Selling, general, and administrative expenses.

Substantially all of our performance obligations are satisfied within twelve months. Accordingly, under the optional exemption provided by ASC 606, we do not disclose revenues allocated to future performance obligations of partially completed contracts.

We do not have any material contract liabilities recorded as of December 29, 2018.

Contract assets relate to our rights to consideration for licenses and royalties due to us as a member of the HDMI consortium, with collection dependent on events other than the passage of time, such as collection of licenses and royalties from customers by the HDMI licensing agent and the finalization of a new royalty sharing agreement. The contract assets are recorded in Prepaid expenses and other current assets in our Consolidated Balance Sheets, and they are transferred to Accounts receivable when the rights become unconditional. In addition to collections related to current year revenue, we received $6.4 million in cash during the second quarter of fiscal 2018 for fiscal 2017 HDMI royalties as a result of the signing of the HDMI Founders royalty sharing agreement for 2017. Collection of this amount had no impact on our reported revenues as it had been accrued to our cumulative effect adjustment, and it was recorded as a reduction to the contract asset during the quarter received.

The following table summarizes the activity for our contract assets during fiscal 2018:



(In thousands)
Balance as of December 31, 2017	$	7,515
Revenues recorded during the period	11,618
Transferred to accounts receivable or collected	(9,990		)
Balance as of December 29, 2018	$	9,143

Disaggregation of Revenue

The following tables provide information about revenue from contracts with customers disaggregated by major class of revenue and by geographical market, based on ship-to location of the end customer, where available, and ship-to location of distributor otherwise:



	Major Class of Revenue	Year Ended *
	(In thousands)	December 29, 2018	December 30, 2017	December 31, 2016
	Product revenue - Distributors	330,719	297,736	310,163
	Product revenue - Direct	49,749	58,766	80,541
	Licensing and services revenue	18,331	29,459	36,350
	Total revenue	398,799	385,961	427,054

	Revenue by Geographical Market	Year Ended *
	(In thousands)	December 29, 2018	December 30, 2017	December 31, 2016
	Asia	298,119	277,638	305,093
	Europe	45,546	44,547	59,835
	Americas	55,134	63,776	62,126
	Total revenue	398,799	385,961	427,054

*	As noted above, amounts in periods prior to fiscal 2018 have not been adjusted under the modified retrospective method of adopting ASC 606 and, therefore, are presented under GAAP in effect during that period.

Net Loss per Share

12 Months Ended

Dec. 29, 2018

Earnings Per Share [Abstract]

Net Loss per Share

Net Loss Per Share

We compute basic Net loss per share by dividing Net loss by the weighted average number of common shares outstanding during the period. To determine diluted share count, we apply the treasury stock method to determine the dilutive effect of outstanding stock option shares, restricted stock units ("RSUs"), and Employee Stock Purchase Plan ("ESPP") shares. Our application of the treasury stock method includes, as assumed proceeds, the average unamortized stock-based compensation expense for the period. When we are in a net loss position, we do not include dilutive securities as their inclusion would reduce the net loss per share.

A summary of basic and diluted Net loss per share is presented in the following table:



	Year Ended
(in thousands, except per share data)	December 29, 2018			December 30, 2017			December 31, 2016
Net loss	$	(26,322	)	$	(70,562	)	$	(54,099	)

Shares used in basic and diluted net loss per share	126,564			122,677			119,994

Basic and diluted net loss per share	$	(0.21	)	$	(0.58	)	$	(0.45	)

The computation of diluted Net loss per share excludes the effects of stock options, RSUs, and ESPP shares that are antidilutive, aggregating approximately the following number of shares:



	Year Ended
(in thousands)	December 29, 2018	December 30, 2017	December 31, 2016
Stock options, RSUs, and ESPP shares excluded as they are antidilutive	7,567	6,622	8,978

Stock options, RSUs, and ESPP shares are considered antidilutive when the aggregate of exercise price and unrecognized stock-based compensation expense are greater than the average market price for our common stock during the period or when we are in a net loss position, as the effects would reduce the loss per share. Stock options, RSUs, and ESPP shares that are antidilutive at December 29, 2018 could become dilutive in the future.

Marketable Securities

12 Months Ended

Dec. 29, 2018

Investments, Debt and Equity Securities [Abstract]

Marketable Securities

We classify our marketable securities as short-term based on their nature and availability for use in current operations. In the periods presented, our Short-term marketable securities consisted of government bonds with contractual maturities of up to two years. The following table summarizes the remaining maturities of our Short-term marketable securities at fair value:



(In thousands)	December 29, 2018		December 30, 2017
Short-term marketable securities:
Maturing within one year	$	7,454	$	4,982
Maturing between one and two years	2,170		—
Total marketable securities	$	9,624	$	4,982

Fair Value of Financial Instruments

12 Months Ended

Dec. 29, 2018

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments



	Fair value measurements as of								Fair value measurements as of
	December 29, 2018								December 30, 2017
(In thousands)	Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
Short-term marketable securities	$	9,624	$	9,624	$	—	$	—	$	4,982	$	4,982	$	—	$	—
Foreign currency forward exchange contracts, net	53		—		53		—		77		—		77		—
Total fair value of financial instruments	$	9,677	$	9,624	$	53	$	—	$	5,059	$	4,982	$	77	$	—

We invest in various financial instruments that may include corporate and government bonds and notes, commercial paper, and certificates of deposit. In addition, we enter into foreign currency forward exchange contracts to mitigate our foreign currency exchange rate exposure. We carry these instruments at their fair value in accordance with ASC 820, "Fair Value Measurements." The framework under the provisions of ASC 820 establishes three levels of inputs that may be used to measure fair value. Each level of input has different levels of subjectivity and difficulty involved in determining fair value, as summarized in "Note 1 - Nature of Operations and Significant Accounting Policies." There were no transfers between any of the levels during fiscal 2018, 2017, and 2016.

In accordance with ASC 320, “Investments-Debt and Equity Securities,” we recorded an unrealized gain of less than $0.1 million during the fiscal year ended December 29, 2018, and an unrealized loss of approximately $0.1 million during the fiscal year ended December 30, 2017 on certain Short-term marketable securities (Level 1 instruments), which have been recorded in Accumulated other comprehensive loss. Future fluctuations in fair value related to these instruments that we deem to be temporary, including any recoveries of previous write-downs, would be recorded to Accumulated other comprehensive loss. If we were to determine in the future that any further decline in fair value is other-than-temporary, we would record an impairment charge, which could have a material adverse effect on our operating results. If we were to liquidate our position in these securities, it is likely that the amount of any future realized gain or loss would be different from the unrealized gain or loss reported in Accumulated other comprehensive loss.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Inventories

12 Months Ended

Dec. 29, 2018

Inventory Disclosure [Abstract]

Inventories



(In thousands)	December 29, 2018		December 30, 2017
Work in progress	$	47,224	$	49,642
Finished goods	19,872		30,261
Total inventories	$	67,096	$	79,903

In the second quarter of 2018, we made the strategic decision to discontinue our millimeter wave business, which included certain wireless technology inventory items. As such, specific inventory reserves of $8.0 million were taken during fiscal 2018 on product lines that were eliminated with the discontinuation of our millimeter wave business and were charged to Cost of product revenue in the Consolidated Statements of Operations.

Property and Equipment

12 Months Ended

Dec. 29, 2018

Property, Plant and Equipment [Abstract]

Property and Equipment



(In thousands)	December 29, 2018			December 30, 2017
Production equipment and software	160,979			155,492
Leasehold improvements	12,648			13,277
Office furniture and equipment	2,623			2,914
	176,250			171,683
Accumulated depreciation and amortization	(141,367		)	(131,260		)
	$	34,883		$	40,423

For fiscal year 2018, depreciation and amortization expense for property and equipment was $13.4 million, including $0.6 million of restructuring expense. For fiscal years 2017 and 2016, depreciation and amortization expense for property and equipment was $16.3 million and $18.4 million, respectively.

In August 2017, we sold building space which we owned in Shanghai, China for gross proceeds of approximately $7.9 million. The building space was vacated in fiscal 2015, upon consolidation of facilities to a single site in Shanghai following our acquisition of Silicon Image. As of the sale date, the building had a historical cost of $3.6 million, accumulated depreciation of $1.4 million and we incurred $1.1 million of direct selling costs, resulting in a net gain on sale of $4.6 million, which is presented as Gain on sale of building in our Consolidated Statements of Operations.

Discontinuation of Business Unit, Sales of Assets and Business Units, and Goodwill	12 Months Ended
	Dec. 29, 2018
Discontinuation of Business Units, Sales of Assets and Business Units, and Goodwill [Abstract]
Discontinuation of Business Unit, Sales of Assets and Business Units, and Goodwill	Discontinuation of Business Unit, Sales of Assets and Business Units, and Goodwill Discontinuation of Business Unit In the second quarter of 2018, we made the strategic decision to discontinue our millimeter wave business, which included certain assets related to our Wireless products, and our Board of Directors approved a related internal restructuring plan. This action was designed to improve profitability, reduce our infrastructure costs, and re-focus on our core business activities. Approximately $24.1 million of total expense was recorded in our Consolidated Statements of Operations in fiscal 2018, including $11.9 million charged to Impairment of acquired intangible assets, $8.0 million charged to Cost of product revenue for inventory reserves, and $4.2 million charged to Restructuring charges for severance and other personnel costs, and for other asset restructuring. See "Note 6 - Inventories," "Note 10 - Impairment of Acquired Intangible Assets," and "Note 15 - Restructuring" for further details on the charges and costs related to the discontinuation of our millimeter wave business. Sales of Assets and Business Units On September 30, 2017, in conjunction with our June 2017 restructuring plan (see "Note 15 - Restructuring"), we sold 100% of the equity of our Hyderabad, India subsidiary and transferred certain assets related to our Simplay Labs testing and certification business to Invecas, Inc. The fair value of purchase price consideration was $5.3 million, which was comprised of $2.3 million of cash and a $3.0 million note receivable. In the third quarter of fiscal 2017, we recorded a $1.8 million loss on the sale, including a $2.2 million disposal of a relative fair value share of our Goodwill, which is included in Other (expense) income, net in the Consolidated Statements of Operations. In April 2016, we sold Qterics to an unrelated third party for net proceeds of $2.0 million, net of cash sold, resulting in a gain of $2.6 million. The gain was included in Other (expense) income, net in the Consolidated Statements of Operations in the period of sale. In the second quarter of fiscal 2017, we received a final escrow payment of $0.3 million related to the sale of Qterics, which was included as a gain in Other (expense) income, net in the Consolidated Statements of Operations for the period of receipt. Goodwill Goodwill represents the excess of the purchase price over the fair value of the underlying net tangible and intangible assets. Goodwill is not amortized, but is instead tested for impairment annually or more frequently if certain indicators of impairment are present. We do not expect goodwill impairment to be tax deductible for income tax purposes. We determined that the strategic decision to discontinue our millimeter wave business in the second quarter of 2018 constituted a triggering event related to goodwill, and we evaluated our goodwill balance as of June 30, 2018. We concluded that goodwill was not impaired, and no impairment charges relating to goodwill were recorded for fiscal 2018. No impairment charges relating to goodwill were recorded for either fiscal 2017 or fiscal 2016 as no indicators of impairment were present. Our asset sale to Invecas, Inc. in September 2017 included a $2.2 million disposal of a relative fair value share of our Goodwill, which is included in Other (expense) income, net in the Consolidated Statements of Operations.

Intangible Assets

12 Months Ended

Dec. 29, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

In connection with our acquisitions of Silicon Image, Inc. in March 2015 and SiliconBlue Technologies, Inc. in December 2011, we recorded identifiable intangible assets related to developed technology, customer relationships, licensed technology, patents, and in-process research and development based on guidance for determining fair value under the provisions of ASC 820, "Fair Value Measurements." Additionally, during fiscal years 2015, 2017, and 2018, we licensed additional third-party technology. We do not believe there is any significant residual value associated with these intangible assets. We are amortizing the intangible assets using the straight-line method over their estimated useful lives.

During the first quarter of fiscal 2017, we sold a portfolio of patents that had been acquired in our acquisition of Silicon Image for $18.0 million. This amount was received in two installments over the first and second quarters of fiscal 2017, and was recognized as Licensing and services revenue in our Consolidated Statements of Operations during the respective periods in which the installment payments were received. As a result of this transaction, Intangible assets, net was reduced by approximately $3.5 million on our Consolidated Balance Sheets.

We monitor the carrying value of our intangible assets for potential impairment and test the recoverability of such assets annually during the fourth quarter and whenever triggering events or changes in circumstances indicate that their carrying amounts may not be recoverable. The results of our assessments are summarized below and more fully detailed in "Note 10 - Impairment of Acquired Intangible Assets."

During the third quarter of fiscal 2018, we concluded that a certain product line had limited future revenue potential due to a decline in customer demand for that product, and we recorded an impairment charge of $0.6 million to the intangible asset associated with that product. In the second quarter of 2018, we made the strategic decision to discontinue our millimeter wave business, which included certain wireless technology intangible assets, and we recorded an impairment charge of $11.9 million to the intangible assets associated with this business. During the fourth quarter of fiscal 2017, we finalized our impairment assessment procedures related to certain of the developed technology intangible assets acquired in our acquisition of Silicon Image, resulting in a $3.8 million reduction to the preliminary impairment charge of $36.2 million recorded in the third quarter of fiscal 2017, for a net impairment charge of $32.4 million in fiscal 2017. During the third quarter of fiscal 2016, we recorded a $7.9 million impairment charge to the intangible assets associated with future HDMI adopter fees.

The following tables summarize the details of our Intangible assets, net as of December 29, 2018 and December 30, 2017:



	December 29, 2018
(In thousands)	Weighted Average Amortization Period (in years)	Gross		Impairment			Accumulated Amortization			Intangible assets, net
Developed technology	5.0	$	112,269	$	(12,486	)	$	(83,185	)	$	16,598
Customer relationships	5.8	22,934		—			(19,048		)	3,886
Licensed technology	5.0	1,195		—			(354		)	841
Total identified intangible assets		$	136,398	$	(12,486	)	$	(102,587	)	$	21,325



	December 30, 2017
(In thousands)	Weighted Average Amortization Period (in years)	Gross		Impairment			Accumulated Amortization			Intangible assets, net
Developed technology	4.7	$	158,700	$	(32,431	)	$	(81,847	)	$	44,422
Customer relationships	5.7	22,934		—			(16,696		)	6,238
Licensed technology	3.5	2,392		—			(1,744		)	648
Total identified intangible assets		$	184,026	$	(32,431	)	$	(100,287	)	$	51,308

We recorded amortization expense related to intangible assets on the Consolidated Statements of Operations as presented in the following table:



	Year Ended
(In thousands)	December 29, 2018		December 30, 2017		December 31, 2016
Research and development	$	277	$	569	$	745
Amortization of acquired intangible assets	17,690		31,340		33,575
	$	17,967	$	31,909	$	34,320

The annual expected amortization expense of acquired intangible assets is as follows:



(In thousands)	Amount
2019	13,613
2020	4,499
2021	2,239
2022	238
Thereafter	736
Total	$	21,325

Impairment of Acquired Intangible Assets	12 Months Ended
Impairment of Acquired Intangible Assets	Dec. 29, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Impairment of Acquired Intangible Assets	Impairment of Acquired Intangible Assets In connection with our acquisitions of Silicon Image in March 2015 and SiliconBlue in December 2011 we recorded identifiable intangible assets related to developed technology, customer relationships, licensed technology, patents, and in-process research. We monitor the carrying value of our acquired intangible assets for potential impairment and test the recoverability of such assets annually during the fourth quarter and whenever events or changes in circumstances indicate that their carrying amounts may not be recoverable. When we are required to determine the fair value of intangible assets other than goodwill, we use the income approach. We start with a forecast of all expected net cash flows associated with the asset and then apply a discount rate to arrive at fair value. During our review of our strategic long-range plan completed at the end of the third quarter of fiscal 2018, we concluded that a certain product line had limited future revenue potential due to a decline in customer demand for that product. We determined that this conclusion constituted an impairment indicator to the related specific developed technology intangible asset acquired in our acquisition of Silicon Image. Our assessment of the fair value of this intangible asset concluded that it had been fully impaired as of September 29, 2018, and we recorded an impairment charge of $0.6 million in the Consolidated Statements of Operations. In the second quarter of 2018, we made the strategic decision to discontinue our millimeter wave business, which included certain wireless technology intangible assets. We determined that this action constituted an impairment indicator related to certain of the developed technology intangible assets acquired in our acquisition of Silicon Image. Our assessment of the fair value of these intangible assets concluded that they had been fully impaired as of June 30, 2018, and we recorded an impairment charge of $11.9 million in the Consolidated Statements of Operations. In the third quarter of fiscal 2017, we updated our annual strategic long-range plan, which resulted in revised forecasts. We also sold 100% of the equity of our Hyderabad, India subsidiary and certain assets related to our Simplay Labs testing and certification business to an unrelated third party. We determined that these activities constituted impairment indicators related to certain of the developed technology intangible assets acquired in our acquisition of Silicon Image. Our assessment of the fair value of these intangible assets concluded that they had been impaired as of September 30, 2017, and we recorded a preliminary impairment charge of $36.2 million in the Consolidated Statements of Operations. During the fourth quarter of fiscal 2017, we completed our detailed analysis and evaluation of the information and assumptions used in the determination of the impairment charge, which included reviewing information, inputs, assumptions, and valuation methodologies used to estimate the fair value of these intangible assets, and finalization of review by an independent valuation expert. As a result, we recorded a $3.8 million reduction to the preliminary impairment charge recorded in the third quarter of fiscal 2017, for a net impairment charge of $32.4 million in fiscal 2017. In September 2016, the Founders of the HDMI consortium, of which we are a member, amended the existing Founders Agreement as part of a regular amendment process resulting in changes to our role as agent for the HDMI consortium and to the model for sharing adopter fee revenues. Under the terms of the amended agreement, our role as the agent was terminated effective January 1, 2017 and a new independent entity was appointed to act as the new HDMI licensing agent with responsibility for licensing and the distribution of royalties among Founders. As a result of the amended model for sharing revenue, we were entitled to a reduced share of adopter fees paid by parties adopting the HDMI standard. We determined that this modification constituted an impairment indicator related to the intangible assets acquired in the Silicon Image acquisition associated with future HDMI adopter fees. Our assessment of the fair value of these intangible assets concluded that they had been impaired as of the end of the third quarter of fiscal 2016, and we recorded a $7.9 million impairment charge in the Consolidated Statements of Operations.

Cost Method Investment and Collaborative Arrangement

12 Months Ended

Dec. 29, 2018

Investments, All Other Investments [Abstract]

Cost Method Investment

Cost Method Investment and Collaborative Arrangement

During fiscal 2015, we purchased a series of preferred stock ownership interests in a privately-held company that designs human-computer interaction technology for total consideration of $5.0 million. This gross investment constituted a 22.7% ownership interest. In the third quarter of fiscal 2016, we made an additional investment of $1.0 million via a convertible debt instrument, bringing our gross investment in the investee to $6.0 million at that time.

In each of the second and third quarters of fiscal 2017, we advanced the investee $1.0 million through a short-term instrument, bringing our total short-term advances to the investee to $2.0 million. As these advances were due and payable in the fourth quarter of fiscal 2017, they were included in Prepaid expenses and other current assets in our Consolidated Balance Sheets while outstanding. The investee repaid the total advances in October 2017.

In 2017, we signed new development and licensing contracts with the investee, and the investee obtained preferred debt that effectively subordinated our ownership position between their debt and common shareholders. After evaluating these events and our investment position, we concluded that we had a variable interest in the privately-held company. However, we were not the primary beneficiary of the investee, were not holding in-substance common stock, and did not have a significant amount of influence to direct the activities that most significantly impact the investee’s economic performance. Accordingly we accounted for our investment in this company under the cost method.

In the fourth quarter of fiscal 2018, we restructured our relationship such that we now own only preferred shares and the prior agreements were canceled, thereby eliminating the variable interest in the investee. See the “Collaborative Arrangement” section of this note for discussion of changes under the restructured relationship. We continue to account for our preferred shares investment in this company under the cost method.

We assess this investment for impairment on a quarterly basis by applying a fair value analysis using a revenue multiple approach. During fiscal 2018, we recognized an impairment adjustment, but our assessment as of December 29, 2018 concluded that no further impairment adjustment was necessary as of that date. The following table summarizes the impairment adjustments against this investment that we have recognized through Other (expense) income, net in the Consolidated Statements of Operations during the fiscal years presented:



	Year Ended
(In thousands)	December 29, 2018			December 30, 2017			December 31, 2016
Impairment of cost-basis investment	$	(266	)	$	(1,761	)	$	(1,459	)

Through December 29, 2018, we have reduced the value of our investment by approximately $4.0 million. The net balance of our investment included in Other long-term assets in the Consolidated Balance Sheets is detailed in the following table:



(In thousands)	Total
Balance at December 31, 2016	$	4,049
Impairment of cost-basis investment	(1,761		)
Balance at December 30, 2017	2,288
Impairment of cost-basis investment	(266		)
Balance at December 29, 2018	$	2,022

Collaborative Arrangement

During the fourth quarter of fiscal 2018, we restructured our relationship with the investee discussed above, including the cancellation of prior arrangements from the 2017 agreements that had provided for: (i) the assignment of certain Intellectual Property ("IP") from the investee to us, (ii) a license of certain IP from the investee to us, (iii) payment of royalties between the parties for future sales of co-developed products, (iv) the performance of certain services for each other at no additional charge. Under the 2017 agreements, we had agreed to make quarterly minimum payments to the investee, which were to be automatically credited against any future revenue share amount owed to the investee under the agreements, and which were accounted for as prepaid royalties under ASC 340. As of the fourth quarter 2018, and under the new contractual arrangement, we have returned the assignment of IP to the investee, we are no longer obligated to make quarterly royalty payments to the investee, and we have recorded Restructuring charges of $3.3 million in the Consolidated Statements of Operations for our abandonment of the accumulated balance of royalties prepaid under the 2017 agreements.

Collaborative Arrangement

Cost Method Investment and Collaborative Arrangement



	Year Ended
(In thousands)	December 29, 2018			December 30, 2017			December 31, 2016
Impairment of cost-basis investment	$	(266	)	$	(1,761	)	$	(1,459	)



(In thousands)	Total
Balance at December 31, 2016	$	4,049
Impairment of cost-basis investment	(1,761		)
Balance at December 30, 2017	2,288
Impairment of cost-basis investment	(266		)
Balance at December 29, 2018	$	2,022

Collaborative Arrangement

Accounts Payable and Accrued Expenses

12 Months Ended

Dec. 29, 2018

Payables and Accruals [Abstract]

Accounts Payable and Accrued Expenses

Included in Accounts payable and accrued expenses in the Consolidated Balance Sheets are the following balances:



(In thousands)	December 29, 2018		December 30, 2017
Trade accounts payable	$	31,880	$	35,350
Liability for non-cancelable contracts	6,078		7,232
Restructuring	4,220		2,088
Other accrued expenses	9,585		9,735
Total accounts payable and accrued expenses	$	51,763	$	54,405

Lease Obligations

12 Months Ended

Dec. 29, 2018

Leases [Abstract]

Lease Obligations

Certain of our facilities are leased under operating leases, which expire at various times through 2026. Rental expense under operating leases was $8.3 million, $8.9 million and $9.5 million for fiscal years 2018, 2017 and 2016, respectively. Future minimum lease commitments at December 29, 2018 are as follows:



Fiscal year	Amount
(In thousands)	Amount
2019	$	7,090
2020	6,893
2021	5,452
2022	4,658
2023	4,229
Thereafter	9,930
	$	38,252

Income Taxes

12 Months Ended

Dec. 29, 2018

Income Tax Disclosure [Abstract]

Income Taxes

The domestic and foreign components of loss before income taxes were as follows:



	Year Ended
(In thousands)	December 29, 2018			December 30, 2017			December 31, 2016
Domestic	$	(8,274	)	$	(17,341	)	$	(33,962	)
Foreign	(15,695		)	(52,372		)	(10,220		)
Loss before taxes	$	(23,969	)	$	(69,713	)	$	(44,182	)

The components of the income tax expense are as follows:



	Year Ended
(In thousands)	December 29, 2018			December 30, 2017		December 31, 2016
Current:
Federal	$	536		$	508	$	1,896
State	38			30		13
Foreign	1,869			304		7,918
	2,443			842		9,827
Deferred:
Federal	—			—		—
State	—			—		—
Foreign	(90		)	7		90
	(90		)	7		90
Income tax expense	$	2,353		$	849	$	9,917

Income tax expense differs from the amount of income tax determined by applying the applicable U.S. statutory federal income tax rate to pretax income as a result of the following differences:



	Year Ended
	December 29, 2018	December 30, 2017	December 31, 2016
	%	%	%
Statutory federal rate	(21)	(35)	(35)
Adjustments for tax effects of:
State taxes, net	(6)	(7)	7
Research and development credits	(5)	(1)	(2)
Stock compensation	8	3	3
Foreign rate differential	20	28	15
Foreign dividends	—	1	—
Foreign withholding taxes	5	—	9
Other permanent	2	—	3
Other deferred tax asset adjustment	13	—	—
Valuation allowance	(11)	(73)	17
Change in uncertain tax benefit accrual	2	1	5
Stock compensation (ASU 2016-09) adoption	—	(8)	—
Tax rate change	—	93	—
Other	3	(1)	1
Effective income tax rate	10	1	23

ASC 740, “Income Taxes”, provides for the recognition of deferred tax assets if realization of these assets is more-likely-than-not. We evaluate both positive and negative evidence to determine if some or all of our deferred tax assets should be recognized on a quarterly basis.

Through December 29, 2018, we continued to evaluate the valuation allowance position in the United States and concluded we should maintain a valuation allowance against the net federal and state deferred tax assets. In making this evaluation, we exercised significant judgment and considered estimates about our ability to generate revenue and gross profits sufficient enough to offset expenditures in future periods within the United States.

We will continue to evaluate both positive and negative evidence in future periods to determine if we should recognize more deferred tax assets. We don't have a valuation allowance in any foreign jurisdictions as we have concluded it is more likely than not that we will realize the net deferred tax assets in future periods. The net decrease in the total valuation allowance affecting the effective tax rate for the year ended December 29, 2018 was approximately $2.6 million, mainly attributable to the write down of intangible assets which had no tax basis.

The components of our net deferred tax assets are as follows:



(In thousands)	December 29, 2018			December 30, 2017
Deferred tax assets:
Accrued expenses and reserves	$	3,714		$	3,096
Inventory	2			2
Deferred Revenue	—			228
Stock-based and deferred compensation	2,660			4,018
Interest expense disallowance	1,283			—
Intangible assets	14,649			19,576
Fixed assets	281			216
Net operating loss carry forwards	88,333			86,410
Tax credit carry forwards	92,208			90,530
Capital loss carry forwards	5,007			3,926
Other	1,130			2,323
Total deferred tax assets	209,267			210,325
Less: valuation allowance	(207,108		)	(209,691		)
Net deferred tax assets	2,159			634
Deferred tax liabilities:
Fixed assets	1,536			559
Deferred revenue	525			—
Other	(57		)	16
Total deferred tax liabilities	2,004			575
Net deferred tax assets	$	155		$	59

At December 29, 2018, we had U.S. federal net operating loss ("NOL") carryforwards (pretax) of approximately $365.3 million that expire at various dates between 2019 and 2037. We had state NOL carryforwards (pretax) of approximately $147.6 million that expire at various dates from 2019 through 2037. We also had federal and state credit carryforwards of $51.5 million and $61.2 million, respectively. Of the $61.2 million state credit carryforwards, $60.2 million do not expire. The federal and remaining state credits expire at various dates from 2019 through 2038.

Future utilization of federal and state net operating losses and tax credit carry forwards may be limited if cumulative changes to ownership exceed 50% within any three-year period. This has not occurred through fiscal 2018. If there is a significant change in ownership, future tax attribute utilization may be restricted (§382 limitation) and NOL carryforwards and/or R&D credits will be reduced to reflect the limitation.

U.S. tax reform required a deemed repatriation of deferred foreign earnings as of December 30, 2017 and no future U.S. taxes should be due on these earnings because of enactment of a 100% dividends received deduction. We had no impact from this transition tax due to utilization of NOL carryforwards. Foreign earnings may be subject to withholding taxes in local jurisdictions if they are distributed and repatriated in the United States.

At December 29, 2018, our unrecognized tax benefits associated with uncertain tax positions were $44.0 million, of which $42.0 million, if recognized, would affect the effective tax rate, subject to valuation allowance. As of December 29, 2018, interest and penalties associated with unrecognized tax benefits were $8.6 million.

Our liability for uncertain tax positions (including penalties and interest) was $26.3 million and $26.9 million at December 29, 2018 and December 30, 2017, respectively, and is recorded as a component of Other long-term liabilities on our Consolidated Balance Sheets. The remainder of our uncertain tax position exposure of $24.9 million is netted against deferred tax assets.

The following table summarizes the changes to unrecognized tax benefits for fiscal years 2018, 2017 and 2016:



(In thousands)	Amount
Balance at January 2, 2016	$	48,207
Additions based on tax positions related to the current year	2,573
Additions based on tax positions of prior years	530
Reduction for tax positions of prior years	(1,824		)
Reduction as a result of lapse of applicable statute of limitations	(1,863		)
Balance at December 31, 2016	47,623
Additions based on tax positions related to the current year	471
Additions based on tax positions of prior years	11
Reductions for tax positions of prior years	(1,226		)
Reduction as a result of lapse of applicable statute of limitations	(2,047		)
Balance at December 30, 2017	44,832
Additions based on tax positions related to the current year	389
Additions based on tax positions of prior years	19
Reductions for tax positions of prior years	(5		)
Reduction as a result of lapse of applicable statute of limitations	(1,235		)
Balance at December 29, 2018	$	44,000

At December 29, 2018, it is reasonably possible that $1.8 million of unrecognized tax benefits and $0.1 million of associated interest and penalties could be recognized during the next twelve months.

We are subject to federal and state income tax as well as income tax in the various foreign jurisdictions in which we operate. Additionally, the years that remain subject to examination are 2015 for federal income taxes, 2014 for state income taxes, and 2012 for foreign income taxes, including years ending thereafter. However, to the extent allowed by law, the tax authorities may have the right to examine prior periods where net operating losses or tax credits were generated and carried forward, and make adjustments up to the amount of the net operating losses or credit carryforward amount.

Our Philippines 2016 income tax return is currently under examination. We are not under examination in any other jurisdiction.

The Tax Cuts and Jobs Act (the "2017 Tax Act"), enacted December 22, 2017, contains provisions that affect us, but the impact will be absorbed by utilizing NOL carry forwards. Reduction of the corporate tax rate from 35% to 21% reduced the value of our domestic deferred tax assets and reduced our associated full valuation allowance on those assets, resulting in no net impact on our Consolidated Statements of Operation.

In March 2018, the FASB issued ASU 2018-05, Income Taxes (Topic 740): Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 118 ("SAB 118"). The SEC issued SAB 118 on December 22, 2017 to address the situation where an SEC reporting company did not have all the necessary information available or analyzed to complete their accounting for the income tax effects of the 2017 Tax Act in the period of enactment. Due to the lack of authoritative guidance issued, complexity, and enactment timing of the 2017 Tax Act, we made a reasonable estimate of the income tax effect of the deemed repatriation of deferred foreign earnings as part of the fiscal 2017 year-end tax provision. Changes to the provisional amount recorded at December 30, 2017 have been finalized in the fourth quarter of fiscal 2018 with the filing of our 2017 tax return. There was no net impact on our Consolidated Statements of Operations, as we adjusted our NOL and valuation allowance.

We are not currently paying U.S. federal income taxes and do not expect to pay such taxes until we fully utilize our tax NOL and credit carryforwards. We expect to pay a nominal amount of state income tax. We are paying foreign income and withholding taxes, which are reflected in income tax expense in our Consolidated Statements of Operations and are primarily related to the cost of operating offshore activities and subsidiaries. We accrue interest and penalties related to uncertain tax positions in income tax expense.

Restructuring

12 Months Ended

Dec. 29, 2018

Restructuring and Related Activities [Abstract]

Restructuring

In December 2018, our management approved and executed an internal restructuring plan (the “December 2018 Plan”), which included a global workforce reduction. This plan also included the abandonment of long lived assets related to the restructuring of our agreements with a privately-held investee (see "Note 11 - Cost Method Investment and Collaborative Arrangement"). Approximately $4.8 million of restructuring expense has been incurred through December 29, 2018 under the December 2018 Plan, and we believe this amount approximates the total costs under the plan and that this plan is substantially complete.

In June 2018, our Board of Directors approved an internal restructuring plan (the "June 2018 Plan"), which included the discontinuation of our millimeter wave business and the use of certain assets related to our Wireless products, and a workforce reduction. The June 2018 Plan is designed to reduce our infrastructure costs and re-focus on our core business activities. Approximately $4.2 million of restructuring expense has been incurred through December 29, 2018 under the June 2018 Plan, and we believe this amount approximates the total costs under the plan and that this plan is substantially complete.

In June 2017, our Board of Directors approved an internal restructuring plan (the "June 2017 Plan"), which included the sale of 100% of the equity of our Hyderabad, India subsidiary and the transfer of certain assets related to our Simplay Labs testing and certification business, a worldwide workforce reduction, and an initiative to reduce our infrastructure costs, including reconfiguring our use of certain leased properties. Under this initiative approved by the Board in 2017, we vacated approximately 50% or our facility in San Jose, California in the fourth quarter of fiscal 2018, and recorded approximately $6.9 million of Restructuring charges from ceasing use of this space. These actions are part of an overall plan to achieve financial targets and to enhance our financial and competitive position by better aligning our revenue and operating expenses. Under this plan, approximately $8.4 million and $8.0 million of expense was incurred during the years ended December 29, 2018 and December 30, 2017, respectively. Approximately $16.4 million of total expense has been incurred through December 29, 2018 under the June 2017 Plan, and we expect the total cost to be approximately $21.5 million to $23.0 million.

In September 2015, we implemented a reduction of our worldwide workforce (the "September 2015 Reduction") separate from the March 2015 Plan. The September 2015 Reduction was designed to resize the company in line with the market environment and to better balance our workforce with the long-term strategic needs of our business. The September 2015 Reduction is substantially complete subject to certain remaining expected costs, which we do not expect to be material but which will be expensed as incurred. Under this reduction, no expense, approximately $0.7 million of credit, and approximately $2.0 million of expense was incurred during the years ended December 29, 2018, December 30, 2017, and December 31, 2016, respectively. Approximately $7.2 million of total expense has been incurred through December 29, 2018 under the September 2015 Reduction, and we believe this amount approximates the total costs expected.

In March 2015, our Board of Directors approved an internal restructuring plan (the "March 2015 Plan"), in connection with our acquisition of Silicon Image. The March 2015 Plan was designed to realize synergies from the acquisition by eliminating redundancies created as a result of combining the two companies. This included reductions in our worldwide workforce, consolidation of facilities, and cancellation of software contracts and engineering tools. The March 2015 Plan is substantially complete subject to certain remaining expected costs that we do not expect to be material and any changes in sublease assumptions should they occur, which will be expensed as incurred. Under this plan, no expense, approximately $0.1 million of credit, and approximately $7.3 million of expense was incurred during the years ended December 29, 2018, December 30, 2017, and December 31, 2016, respectively. Approximately $20.5 million of total expense has been incurred through December 29, 2018 under the March 2015 Plan, and we believe this amount approximates the total costs expected.

These expenses and credits were recorded to Restructuring charges on our Consolidated Statements of Operations. The restructuring accrual balance is presented in Accounts payable and accrued expenses (includes restructuring) and Other long-term liabilities on our Consolidated Balance Sheets.

The following table displays the activity related to the restructuring plans described above:



(In thousands)	Severance & Related (1)			Lease Termination			Software Contracts & Engineering Tools (2)			Other See note (3) for 2018			Total
Balance at January 2, 2016	$	3,696		$	1,005		$	377		$	—		$	5,078
Restructuring charges	2,883			2,993			1,903			1,488			9,267
Costs paid or otherwise settled	(5,778		)	(2,962		)	(2,255		)	(1,476		)	(12,471		)
Balance at December 31, 2016	$	801		$	1,036		$	25		$	12		$	1,874
Restructuring charges	2,484			811			3,066			835			7,196
Costs paid or otherwise settled	(2,093		)	(977		)	(2,731		)	(822		)	(6,623		)
Balance at December 30, 2017	$	1,192		$	870		$	360		$	25		$	2,447
Restructuring charges	5,696			7,379			913			3,361			17,349
Costs paid or otherwise settled	(5,074		)	381			(1,055		)	(3,368		)	(9,116		)
Balance at December 29, 2018	$	1,814		$	8,630		$	218		$	18		$	10,680



(1)	Includes employee relocation costs and accelerated stock compensation
(2)	Includes cancellation of contracts, asset impairments, and accelerated depreciation on certain enterprise resource planning and customer relationship management systems
(3)	In fiscal 2018, "Other" activity includes the abandonment of long lived assets related to the restructuring of our agreements with a privately-held investee

Long-Term Debt

12 Months Ended

Dec. 29, 2018

Debt Disclosure [Abstract]

Long-term Debt

Long-Term Debt

On March 10, 2015, we entered into a secured credit agreement (the "Credit Agreement") with Jefferies Finance, LLC and certain other lenders for purposes of funding, in part, our acquisition of Silicon Image. The Credit Agreement provided for a $350 million term loan (the "Term Loan") maturing on March 10, 2021 (the "Term Loan Maturity Date"). We received $346.5 million net of an original issue discount of $3.5 million and we paid debt issuance costs of $8.3 million. The Term Loan bears variable interest equal to the one-month LIBOR, subject to a 1.00% floor, plus a spread of 4.25%. The current effective interest rate on the Term Loan is 7.30%.

The Term Loan is payable through a combination of (i) quarterly installments of approximately $0.9 million, (ii) annual excess cash flow payments as defined in the Credit Agreement, which are due 95 days after the last day of our fiscal year, and (iii) any payments due upon certain issuances of additional indebtedness and certain asset dispositions, with any remaining outstanding principal amount due and payable on the Term Loan Maturity Date. The percentage of excess cash flow we are required to pay ranges from 0% to 75%, depending on our leverage and other factors as defined in the Credit Agreement. As of December 29, 2018, the Credit Agreement required a 75% excess cash flow payment.

In the first quarter of fiscal 2018, we made a required quarterly installment payment of $0.9 million. In the second quarter of fiscal 2018, we made a required excess cash flow payment of $0.2 million, a required quarterly installment payment of $0.9 million, and an additional $10.0 million principal payment. In the third quarter of fiscal 2018, we made a required quarterly installment payment of $0.9 million, and an additional $15.0 million principal payment. In the fourth quarter of fiscal 2018, we made a required quarterly installment payment of $0.9 million, and an additional $15.0 million principal payment. As of December 29, 2018, we had approximately $263.0 million outstanding under the Credit Agreement.

While the Credit Agreement does not contain financial covenants, it does contain informational covenants and certain restrictive covenants, including limitations on liens, mergers and consolidations, sales of assets, payment of dividends, and indebtedness. We were in compliance with all such covenants in all material respects at December 29, 2018.

The original issue discount and the debt issuance costs have been accounted for as a reduction to the carrying value of the Term Loan on our Consolidated Balance Sheets and are being amortized to Interest expense in our Consolidated Statements of Operations over the contractual term, using the effective interest method.

The fair value of the Term Loan approximates the carrying value, which is reflected in our Consolidated Balance Sheets as follows:



(in thousands)	December 29, 2018			December 30, 2017
Principal amount	$	263,033		$	306,791
Unamortized original issue discount and debt issuance costs	(3,386		)	(5,616		)
Less: Current portion of long-term debt	(8,290		)	(1,508		)
Long-term debt	$	251,357		$	299,667

Interest expense related to the Term Loan was included in Interest expense on the Consolidated Statements of Operations as follows:



			Year Ended
(in thousands)	December 29, 2018		December 30, 2017		December 31, 2016
Contractual interest	$	18,600	$	16,503	$	18,518
Amortization of debt issuance costs and discount	2,230		1,982		1,350
Total Interest expense related to the Term Loan	$	20,830	$	18,485	$	19,868

As of December 29, 2018, expected future principal payments on the Term Loan were as follows:



Fiscal year	(in thousands)

2019	10,031
2020	63,131
2021	189,871
	$	263,033

Stock-Based Compensation Plans

12 Months Ended

Dec. 29, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-Based Compensation Plans

Employee and Director Stock Options, Restricted Stock and ESPP

We have four equity incentive plans (the "1996 Stock Incentive Plan," the "2001 Stock Plan," the "2013 Incentive Plan, and the "2011 Non-Employee Director Equity Incentive Plan") and in connection with our acquisition of Silicon Image in 2015, we assumed outstanding awards under the Silicon Image, Inc. 2008 Equity Incentive Plan and the Silicon Image, Inc. 1999 Equity Incentive Plan (together, the “Silicon Image Equity Incentive Plans”). Awards granted under the 1996 Stock Incentive Plan remain outstanding, but no awards granted under the 2001 Stock Plan remain outstanding, and no shares are available for future awards under these plans. Shares remain available for grants to employees and non-employee directors only under the 2013 Incentive Plan and the 2011 Non-Employee Director Equity Incentive Plan, respectively. In addition, we have made grants of inducement awards to certain of our newly hired executives and employees that are granted outside of, but governed by, the 2013 Incentive Plan. "Incentive stock options" under Section 422 of the U.S. Internal Revenue Code and restricted stock unit ("RSU") grants are part of our equity compensation practices for employees who receive equity grants. Options and RSUs generally vest quarterly over a four-year period beginning on the grant date. The contractual terms of options granted do not exceed ten years.

In May 2012, the Company's stockholders approved the 2012 Employee Stock Purchase Plan ("2012 ESPP"), which authorizes the issuance of 3.0 million shares of common stock to eligible employees to purchase shares of common stock through payroll deductions, which cannot exceed 10% of an employee's compensation. The purchase price of the shares is the lower of 85% of the fair market value of the stock at the beginning of each six-month offering period or 85% of the fair market value at the end of such period. We have treated the 2012 ESPP as a compensatory plan. We recorded $0.6 million related compensation expense in both fiscal 2018 and 2016. During fiscal 2017 only, the ESPP was suspended and we recorded no related compensation expense.

At December 29, 2018, a total of 6.1 million shares of our common stock were available for future grants under the 2013 Incentive Plan, and the 2011 Non-Employee Director Equity Incentive Plan. Following our 2018 Shareholder meeting, a share ratio of 2.2:1 was applied to the 2013 Incentive Plan. This ratio takes two and two tenths shares out of the 2013 Plan for every one full value granted. During fiscal 2018, a total of 2.5 million shares were adjusted out of the 2013 Plan. Shares subject to stock option grants that expire or are canceled, without delivery of such shares, generally become available for re-issuance under equity incentive plans. At December 29, 2018, a total of 1.7 million shares of our common stock were available for future purchases under the 2012 ESPP. On March 10, 2015, in conjunction with the acquisition of Silicon Image, we assumed certain outstanding stock option and RSU grants of the Silicon Image Equity Incentive Plans. We assumed all stock option grants that were unvested or vested and out-of-the-money and all outstanding unvested RSU grants. The exchange ratio for the conversion was 1.09816 for all grants. The conversion ratio was determined by the weighted average closing price of Lattice common stock for the ten days prior to the acquisition date divided by the offer price of $7.30. The converted outstanding option grants totaled 2,087,605 shares and converted RSU grants totaled 2,025,255 shares as of March 10, 2015. As of December 29, 2018, 76,449 options and 2,223 RSU shares arising from this conversion remained outstanding.

Stock-Based Compensation

Total stock-based compensation expense included in our Consolidated Statements of Operations is presented in the following table:



	Year Ended
(In thousands)	December 29, 2018		December 30, 2017		December 31, 2016
Cost of products sold	$	940	$	795	$	888
Research and development	4,357		5,245		7,928
Selling, general, and administrative	8,349		6,503		7,397
Total stock-based compensation	$	13,646	$	12,543	$	16,213

The stock-based compensation expense included in Selling, general, and administrative expense for fiscal 2018 includes approximately $1.4 million of additional one-time expense for acceleration of stock compensation under the CEO separation agreement executed with our former CEO during the first quarter of fiscal 2018.

ASC 718, “Compensation-Stock Compensation (“ASC 718”),” requires that we recognize compensation expense for only the portion of employee and director options and ESPP rights that are expected to vest.

The fair values of each option award on the date of grant and of the shares expected to be issued under the employee stock purchase plan are estimated using the Black-Scholes valuation model and the assumptions noted in the following table. The expected term is based on historical vested option exercises and includes an estimate of the expected term for options that are fully vested and outstanding. The expected volatility of both stock options and ESPP shares is based on the daily historical volatility of our stock price, measured over the expected term of the option or the ESPP purchase period. The risk-free interest rate is based on the implied yield on a U.S. Treasury zero-coupon issue with a remaining term closest to the expected term of the option. The dividend yield reflects that we have not paid any cash dividends since inception and do not intend to pay any cash dividends in the foreseeable future.

The following table summarizes the assumptions used in the valuation of stock option and ESPP compensation:



	Year Ended
	December 29, 2018	December 30, 2017	December 31, 2016
Employee and Director Stock Options
Expected volatility	39.87% to 41.11%	40.96% to 48.01%	44.2% to 50.8%
Risk-free interest rate	2.29% to 2.78%	1.99% to 2.09%	.94% to 2.06%
Expected term (years)	4.08 to 4.25	4.08 to 4.25	4.06 to 4.78
Employee Stock Purchase Plan *
Weighted average expected volatility	36.4%	—%	57.9%
Weighted average risk-free interest rate	1.61%	—%	0.43%
Expected term	6 months	n/a	6 months

* ESPP suspended during fiscal 2017 only

At December 29, 2018, there was $6.8 million of total unrecognized compensation cost related to unvested employee and director stock options, which is expected to be recognized over a weighted average period of 2.3 years. Our current practice is to issue new shares to satisfy option exercises. Compensation expense for all stock-based compensation awards is recognized using the straight-line method.

The following table summarizes our stock option activity and related information for the year ended December 29, 2018:



(Shares and aggregate intrinsic value in thousands)	Shares		Weighted average exercise price		Weighted average remaining contractual term (years)	Aggregate Intrinsic Value
Balance, December 30, 2017	12,939		$	5.76
Granted	843		7.61
Exercised	(4,882	)	5.79
Forfeited or expired	(2,284	)	5.87
Balance, December 29, 2018	6,616		$	5.94
Vested and expected to vest at December 29, 2018	6,616		$	5.94	4.26	$	6,788
Exercisable, December 29, 2018	3,122		$	5.70	2.82	$	3,668

The aggregate intrinsic value in the table above represents the total pretax intrinsic value (the difference between the Company's closing stock price on the last trading day of the fiscal year and the exercise price, multiplied by the number of in-the-money options) that would have been received by the option holders had all option holders exercised their options on that day. This amount changes based on the fair market value of the Company's stock. Total intrinsic value of options exercised for fiscal 2018, 2017, and 2016 was $6.5 million, $2.2 million, and $3.3 million, respectively. The total fair value of options and RSUs vested and expensed in fiscal 2018, 2017, and 2016 was $13.0 million, $12.5 million, and $15.6 million, respectively.

The resultant grant date weighted-average fair values for stock options granted, calculated using the Black-Scholes option pricing model with the noted assumptions for stock options, were $2.73, $2.02 and $2.14 for fiscal years 2018, 2017 and 2016, respectively. The weighted average fair values for the ESPP, calculated using the Black-Scholes option pricing model with the noted assumptions for the ESPP, were $1.50 and $1.82 for fiscal years 2018 and 2016, respectively.

The following table summarizes our RSU activity for the year ended December 29, 2018:



(Shares in thousands)	Shares		Weighted average grant date fair value
Balance, December 30, 2017	2,766		$	5.85
Granted	3,498		8.02
Vested	(1,124	)	5.97
Forfeited or expired	(728	)	5.90
Balance, December 29, 2018	4,412		$	7.53

At December 29, 2018 there was $31.6 million of total unrecognized compensation cost related to unvested RSUs. Our current practice is to issue new shares when RSUs vest. Compensation expense for RSUs is recognized using the straight-line method over the related vesting period.

In fiscal years 2016 through 2018, we granted stock options and RSUs with either a market condition or a performance condition to certain executives. The market condition is a comparison of the Company's relative Total Shareholder Return ("TSR") when compared to the TSR of a component of companies of the PHLX Semiconductor Sector Index over a measurement period. TSR is a measure of stock price appreciation plus dividends paid, if any, in the performance period. We determined and fixed the fair value of the awards with a market condition on the date of grant using a lattice-based option-pricing model. The valuation of these awards incorporated a Monte-Carlo simulation, and considered the likelihood that we would achieve the market condition. The performance condition is based upon the Company’s generating specified “adjusted” EBITDA levels on a trailing four-quarter basis in any two consecutive trailing four-quarter periods. We valued the RSUs with a performance condition using the market price on the day of grant.

The options with a market condition granted in fiscal years 2016 and 2017 have a two year vesting period and vest between 0% and 200% of the target amount, based on the Company's relative TSR when compared to the TSR of a component of companies of the PHLX Semiconductor Sector Index over a two year period. Under the terms of the grants, executives will receive the target amount if the Company’s TSR relative to that of the Index achieves or exceeds the 50^th percentile. Executives may receive 200% if the Company’s TSR exceeds the 75^th percentile. No vesting occurs if the Company’s TSR does not exceed the 25^th percentile.

In September 2018, we granted inducement awards outside of, but subject to the terms and conditions of the 2013 Incentive Plan to our incoming President and Chief Executive Officer. These awards included restricted stock units that vest and become payable upon satisfaction of certain market and performance conditions. The market and performance conditions include TSR and Adjusted EBITDA targets, respectively. The TSR-based awards vest and become payable over a three-year period based on the Company’s TSR relative to the PHLX Semiconductor Sector Index, with 100% of the units vesting at the 50th percentile and 250% of the units vesting at the 75th percentile achievement, zero vesting if relative TSR is below the 25th percentile, and vesting scaling linearly for achievement between the 25th and 75th percentile. The Adjusted EBITDA-based awards will vest and become payable based upon the Company’s generating specified “adjusted” EBITDA levels on a trailing four quarter basis in any two consecutive trailing four-quarter periods.

In September 2018, we granted inducement awards outside of, but subject to the terms and conditions of the 2013 Incentive Plan to our incoming Corporate Vice President of Research and Development, and we granted awards from the 2013 Incentive Plan to certain executives including our incoming Corporate Vice President of Marketing and Strategy and our Corporate Vice President and General Counsel. These awards included restricted stock units that would vest and become payable upon achievement of a target TSR. The awards vest and become payable over a three-year period based on the Company’s TSR relative to the PHLX Semiconductor Sector Index, with 100% of the units vesting at the 50th percentile and 200% of the units vesting at the 75th percentile achievement, zero vesting if relative TSR is below the 25th percentile, and vesting scaling linearly for achievement between the 25th and 75th percentile.

The following table summarizes the activity for our stock options and RSUs with a market or performance condition:



(Shares in thousands)	Unvested		Vested		Total
Balance, December 30, 2017	707		83		790
Granted	788		—		788
Vested	(31	)	31		—
Exercised	—		(104	)	(104	)
Canceled	(555	)	(10	)	(565	)
Balance, December 29, 2018	909		—		909

We incurred stock compensation expense related to these stock option and RSU awards with a market or performance condition of approximately $0.9 million, $0.5 million, and $0.8 million in fiscal years 2018, 2017, and 2016, respectively, which is recorded as a component of total stock-based compensation expense.

The following table summarizes the assumptions used in the valuation of stock options and RSUs with a market or performance condition:



	Year Ended
	December 29, 2018	December 30, 2017	December 31, 2016
Executive stock options with a market condition
Expected volatility	n/a	41%	46%
Risk-free interest rate	n/a	1.9%	1.1%
Expected term (years)	n/a	4.5	4.5
Executive RSUs with a market or performance condition
Expected volatility	41.06% to 41.74%	n/a	n/a
Risk-free interest rate	2.71% to 2.87%	n/a	n/a
Expected term (years)	3.00 to 3.16	n/a	n/a

Employee Benefit Plans	12 Months Ended
Employee Benefit Plans	Dec. 29, 2018
Compensation Related Costs [Abstract]
Employee Benefit Plans	Employee Benefit Plans Qualified Investment Plan In 1990, we adopted a 401(k) plan, which provides participants with an opportunity to accumulate funds for retirement. The plan does not allow investments in the Company's common stock. The plan allows for the Company to make discretionary matching contributions in cash. We recorded matching contributions of approximately $0.6 million, $0.8 million, and $0.9 million in fiscal years 2018, 2017, and 2016, respectively. 2018 Cash Incentive Plan On January 8, 2018, upon the recommendation of the Compensation Committee, the Board of Directors of the Company approved the 2018 Cash Incentive Plan (the “2018 Cash Plan”). The chief executive officer, other executive officers, and other members of senior management, including vice presidents and director-level employees, together with all other employees of the Company not on the Company's sales incentive plan are eligible to participate in the 2018 Cash Plan. Under the 2018 Cash Plan, individual cash incentive payments for the eligible employees will be based both on Company financial performance, as measured by achievement of operating income (before incentive plan accruals) and revenue goals within specified ranges established by the Compensation Committee, and Company performance, as measured by the achievement of personal management objectives. The Compensation Committee determines the performance of the chief executive officer, the chief financial officer and other participants based on the achievement of the management objectives established by the Compensation Committee during the first fiscal quarter of 2018. There was $5.9 million of expense recorded under this plan in fiscal 2018. 2017 Cash Incentive Plan On December 20, 2016, upon the recommendation of the Compensation Committee, the Board of Directors of the Company approved the 2017 Cash Incentive Plan (the “2017 Cash Plan”). The chief executive officer, other executive officers, and other members of senior management, including vice presidents and director-level employees, together with all other employees of the Company not on the Company's sales incentive plan are eligible to participate in the 2017 Cash Plan. Under the 2017 Cash Plan, individual cash incentive payments for the eligible employees will be based both on Company financial performance, as measured by achievement of operating income (before incentive plan accruals) and revenue goals within specified ranges established by the Compensation Committee, and Company performance, as measured by the achievement of personal management objectives. The Compensation Committee determines the performance of the chief executive officer, the chief financial officer and other participants based on the achievement of the management objectives established by the Compensation Committee during the first fiscal quarter of 2017. There was $7.2 million of expense recorded under this plan in fiscal 2017. 2016 Cash Incentive Plan On December 21, 2015, upon the recommendation of the Compensation Committee, the Board of Directors of the Company approved the 2016 Cash Incentive Plan (the “2016 Cash Plan”). The chief executive officer, other executive officers, and other members of senior management, including vice presidents and director-level employees, together with all other employees of the Company not on the Company's sales incentive plan are eligible to participate in the 2016 Cash Plan. Under the 2016 Cash Plan, individual cash incentive payments for the eligible employees will be based both on Company financial performance, as measured by achievement of operating income (before incentive plan accruals) and revenue goals within specified ranges established by the Compensation Committee, and Company performance, as measured by the achievement of personal management objectives. The Compensation Committee determines the performance of the chief executive officer, the chief financial officer and other participants based on the achievement of the management objectives established by the Compensation Committee during the first fiscal quarter of 2016. There was $4.7 million of expense recorded under this plan in fiscal 2016.

Contingencies	12 Months Ended
Contingencies	Dec. 29, 2018
Commitments and Contingencies Disclosure [Abstract]
Contingencies	Contingencies Legal Matters On or about December 19, 2018, Steven A.W. De Jaray, Perienne De Jaray and Darrell R. Oswald (collectively, the “Plaintiffs”) commenced an action against the Company and several unnamed defendants in the Multnomah County Circuit Court of the State of Oregon, in connection with the sale of certain products by the Company to defendants in or around 2008. Plaintiffs allege that the Company violated the Lanham Act, engaged in negligence and fraud by failing to disclose to purchaser the export-controlled status of the subject parts. Plaintiffs seek damages of $138 million, treble damages, and other remedies. In January 2019, the Company removed the action to the United States District Court for the District of Oregon. At this stage of the proceedings, the Company does not have an estimate of the likelihood or the amount of any potential exposure to the Company; however, the Company believes that these claims are without merit and intends to vigorously defend the action. See “Litigation and unfavorable results of legal proceedings could adversely affect our financial condition and operating results” in “Risk Factors” in Item 1A of Part I of this Annual Report on Form 10-K. From time to time, we are exposed to certain asserted and unasserted potential claims. Periodically, we review the status of each significant matter and assess its potential financial exposure. If the potential loss from any claim or legal proceeding is considered probable and a range of possible losses can be estimated, we then accrue a liability for the estimated loss. Legal proceedings are subject to uncertainties, and the outcomes are difficult to predict. Because of such uncertainties, accruals are based only on the best information available at the time. As additional information becomes available, we reassess the potential liability related to pending claims and litigation and may revise estimates.

Valuation and Qualifying Accounts

12 Months Ended

Dec. 29, 2018

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

Valuation and Qualifying Accounts

The following table displays the activity related to changes in our valuation and qualifying accounts:



(In thousands)	Balance at beginning of period		Charged (Credit) to costs and expenses			Charged (credit) to other accounts			Settlements & write-offs net of recoveries			Balance at end of period
Fiscal year ended December 29, 2018
Valuation allowance for deferred tax assets	209,691		(2,583		)	—			—			207,108
Allowance for doubtful accounts	9,371		1			73			(9,248		)	197
Allowance for warranty expense	255		580			—			(482		)	353
	$	219,317	$	(2,002	)	$	73		$	(9,730	)	$	207,658
Fiscal year ended December 30, 2017
Valuation allowance for deferred tax assets	$	260,687	$	(50,960	)	$	(36	)	$	—		$	209,691
Allowance for doubtful accounts	9,299		3			38			31			9,371
Allowance for warranty expense	352		100			—			(197		)	255
	$	270,338	$	(50,857	)	$	2		$	(166	)	$	219,317
Fiscal year ended December 31, 2016
Valuation allowance for deferred tax assets	$	252,578	$	7,450		$	659		$	—		$	260,687
Allowance for doubtful accounts	621		7,362			2,284			(968		)	9,299
Allowance for warranty expense	370		216			—			(234		)	352
	$	253,569	$	15,028		$	2,943		$	(1,202	)	$	270,338

Segment and Geographic Information

12 Months Ended

Dec. 29, 2018

Segment Reporting [Abstract]

Segment and Geographic Information

Segment Information

As of December 29, 2018, we had one operating segment: the core Lattice business, which includes semiconductor devices, evaluation boards, development hardware, and related intellectual property licensing, services, and sales. Qterics, a discrete software-as-a-service business unit, was previously an immaterial operating segment in the Lattice legal entity structure prior to the sale of Qterics in April 2016.

Geographic Information

Our revenue by major geographic area, based on ship-to location of the end customer, where available, and ship-to location of distributor otherwise, is presented in the following table:



	Year Ended
(In thousands)	December 29, 2018			December 30, 2017			December 31, 2016
United States:	$	38,585	10%	$	48,315	13%	$	51,752	12%

China*	202,983		51	193,590		50	186,865		44
Europe	45,546		11	44,547		12	59,835		14
Japan	44,033		11	42,286		11	49,080		12
Taiwan	16,124		4	14,846		4	31,322		7
Other Asia*	34,979		9	26,916		7	37,826		9
Other Americas	16,549		4	15,461		4	10,374		3
Total foreign revenue	360,214		90	337,646		87	375,302		88
Total revenue	$	398,799	100%	$	385,961	100%	$	427,054	100%

* During 2017, we realigned our geographic categories to group Hong Kong with China rather than with Other Asia. Prior periods have been

reclassified to match current period presentation.

Our Property and equipment, net by country at the end of each period was as follows:



(In thousands)	December 29, 2018		December 30, 2017		December 31, 2016
United States	$	27,353	$	30,338	$	30,532

China	2,360		4,632		10,617
Philippines	3,319		3,883		4,928
Taiwan	949		958		2,310
Japan	324		313		637
Other	578		299		457
Total foreign property and equipment, net	7,530		10,085		18,949
Total property and equipment, net	$	34,883	$	40,423	$	49,481

Quarterly Financial Data (Unaudited)

12 Months Ended

Dec. 29, 2018

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Data (Unaudited)

A summary of the Company's consolidated quarterly results of operations is as follows:



	2018											2017 *
(In thousands, except per share data)	Q4			Q3		Q2			Q1			Q4			Q3			Q2			Q1
Revenue	$	95,977		$	101,484	$	102,715		$	98,623		$	95,266		$	91,971		$	94,137		$	104,587
Gross margin	54,306			58,364		50,248			56,521			51,216			53,322			51,209			60,832
Restructuring charges	11,854			90		4,376			1,029			2,483			3,071			1,576			66
Net (loss) income	$	(7,121	)	$	6,974	$	(20,223	)	$	(5,952	)	$	(7,213	)	$	(43,052	)	$	(13,022	)	$	(7,275	)

Net (loss) income per share - basic and diluted	$	(0.05	)	$	0.05	$	(0.16	)	$	(0.05	)	$	(0.06	)	$	(0.35	)	$	(0.11	)	$	(0.06	)

* Results for 2017 are presented in accordance with ASC 605, which was in effect during that fiscal year.

Nature of Operations and Significant Accounting Policies (Policies)

12 Months Ended

Dec. 29, 2018

Accounting Policies [Abstract]

Fiscal Reporting Period

Principles of Consolidation and Presentation

Principles of Consolidation

The accompanying Consolidated Financial Statements include the accounts of Lattice and its subsidiaries after the elimination of all intercompany balances and transactions

Use of Estimates

Cash Equivalents and Marketable Securities

Fair Value of Financial Instruments

Foreign Exchange and Translation of Foreign Currencies

Derivative Financial Instruments

We mitigate foreign currency exchange rate risk by entering into foreign currency forward exchange contracts, details of which are presented in the following table:



	December 29, 2018		December 30, 2017
Total cost of contracts for Japanese yen (in thousands)	$	1,955	$	2,204
Number of contracts	2		2
Settlement month	June 2019		June 2018

Concentration Risk

Potential exposure to concentration risk may impact revenue, trade receivables, marketable securities, and supply of wafers for our new products.



	Year Ended
	December 29, 2018		December 30, 2017		December 31, 2016
Revenue attributable to top five end customers	18	%	26	%	27	%
Revenue attributable to largest end customer	6.1	%	7.3	%	9.9	%



	Year Ended
	December 29, 2018		December 30, 2017		December 31, 2016
Arrow Electronics Inc.	29	%	24	%	24	%
Weikeng Group	25		27		22
All others	29		26		27
Revenue attributable to distributors*	83	%	77	%	73	%



*	During the first quarter of 2018, we updated our channel categories to group all forms of distribution into a single channel. Prior periods have been reclassified to match the current period presentation.

Inventories and Cost of Product Revenue

Property and Equipment

Equity Investments in Privately Held Companies

Impairment of Long-Lived Assets

Valuation of Goodwill

Leases

Restructuring Charges

Research and Development

Accounting for Income Taxes

Stock-Based Compensation

New Accounting Pronouncements

Recently Issued Accounting Standards

Revenue recognition

Product Revenue

Identify the performance obligations in the contract - For each contract, we consider our promise to transfer each distinct product to be the identified performance obligations.

Licensing and Services Revenue

Nature of Operations and Significant Accounting Policies (Tables)

12 Months Ended

Dec. 29, 2018

Accounting Policies [Abstract]

Schedule of Derivative Instruments

We mitigate foreign currency exchange rate risk by entering into foreign currency forward exchange contracts, details of which are presented in the following table:



	December 29, 2018		December 30, 2017
Total cost of contracts for Japanese yen (in thousands)	$	1,955	$	2,204
Number of contracts	2		2
Settlement month	June 2019		June 2018

Schedules of Revenue Concentration of Risk

The percentage of total revenue attributable to our top five identified end customers and largest identified end customer is presented in the following table:



	Year Ended
	December 29, 2018		December 30, 2017		December 31, 2016
Revenue attributable to top five end customers	18	%	26	%	27	%
Revenue attributable to largest end customer	6.1	%	7.3	%	9.9	%

Revenue attributable to distributors as a percentage of total revenue is presented in the following table:



	Year Ended
	December 29, 2018		December 30, 2017		December 31, 2016
Arrow Electronics Inc.	29	%	24	%	24	%
Weikeng Group	25		27		22
All others	29		26		27
Revenue attributable to distributors*	83	%	77	%	73	%



*	During the first quarter of 2018, we updated our channel categories to group all forms of distribution into a single channel. Prior periods have been reclassified to match the current period presentation.

- Definition

Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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+ Details

Revenue from Contracts with Customers (Tables)

12 Months Ended

Dec. 29, 2018

Revenue from Contract with Customer [Abstract]

Schedule of New Accounting Pronouncements

ASC 606 requires us to disclose the effect of adoption on each financial statement line item in the current reporting period during 2018 as compared to the revenue recognition accounting standard that was in effect in 2017, and an explanation of the reasons for significant changes. Such information is as follows:



Condensed Consolidated Statement of Operations
	Year ended December 29, 2018
(In thousands, except per share data)	As reported under new standard		Adjustments		Pro forma as if previous standard was in effect
Product revenue	380,468		(14,098	)	366,370
Licensing and services revenue	18,331		(1,478	)	16,853
Cost of product revenue	179,101		(6,399	)	172,702
Net loss	(26,322	)	(9,177	)	(35,499	)

Net loss per share, basic and diluted	(0.21	)	(0.07	)	(0.28	)



Condensed Consolidated Balance Sheets
	As of December 29, 2018
(In thousands)	As reported under new standard		Adjustments		Pro forma as if previous standard was in effect
Accounts receivable, net of allowance for doubtful accounts	60,890		6,600		67,490
Inventories	67,096		78		67,174
Prepaid expenses and other current assets	27,762		(9,775	)	17,987
Total assets	623,687		(3,097	)	620,590

Accounts payable and accrued expenses (includes restructuring)	51,763		(1,156	)	50,607
Deferred income and allowances on sales to distributors	—		34,637		34,637
Accumulated deficit	(476,783	)	(36,578	)	(513,361	)
Total liabilities and stockholders' equity	623,687		(3,097	)	620,590



Condensed Consolidated Statement of Cash Flows
	Year ended December 29, 2018
(In thousands)	As reported under new standard		Adjustments		Pro forma as if previous standard was in effect
Cash flows from operating activities:
Net loss	(26,322	)	(9,177	)	(35,499	)
Accounts receivable, net	(3,978	)	(8,408	)	(12,386	)
Inventories	13,177		(448	)	12,729
Prepaid expenses and other assets	(11,667	)	2,260		(9,407	)
Accounts payable and accrued expenses (includes restructuring)	13,325		(1,614	)	11,711
Deferred income and allowances on sales to distributors	—		17,387		17,387

Activity for Contract Assets

The following table summarizes the activity for our contract assets during fiscal 2018:



(In thousands)
Balance as of December 31, 2017	$	7,515
Revenues recorded during the period	11,618
Transferred to accounts receivable or collected	(9,990		)
Balance as of December 29, 2018	$	9,143

Disaggregation of Revenue



	Major Class of Revenue	Year Ended *
	(In thousands)	December 29, 2018	December 30, 2017	December 31, 2016
	Product revenue - Distributors	330,719	297,736	310,163
	Product revenue - Direct	49,749	58,766	80,541
	Licensing and services revenue	18,331	29,459	36,350
	Total revenue	398,799	385,961	427,054

	Revenue by Geographical Market	Year Ended *
	(In thousands)	December 29, 2018	December 30, 2017	December 31, 2016
	Asia	298,119	277,638	305,093
	Europe	45,546	44,547	59,835
	Americas	55,134	63,776	62,126
	Total revenue	398,799	385,961	427,054

*	As noted above, amounts in periods prior to fiscal 2018 have not been adjusted under the modified retrospective method of adopting ASC 606 and, therefore, are presented under GAAP in effect during that period.

Net Loss per Share (Tables)

12 Months Ended

Dec. 29, 2018

Earnings Per Share [Abstract]

Schedule of Earnings Per Share Reconciliation

A summary of basic and diluted Net loss per share is presented in the following table:



	Year Ended
(in thousands, except per share data)	December 29, 2018			December 30, 2017			December 31, 2016
Net loss	$	(26,322	)	$	(70,562	)	$	(54,099	)

Shares used in basic and diluted net loss per share	126,564			122,677			119,994

Basic and diluted net loss per share	$	(0.21	)	$	(0.58	)	$	(0.45	)

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share

The computation of diluted Net loss per share excludes the effects of stock options, RSUs, and ESPP shares that are antidilutive, aggregating approximately the following number of shares:



	Year Ended
(in thousands)	December 29, 2018	December 30, 2017	December 31, 2016
Stock options, RSUs, and ESPP shares excluded as they are antidilutive	7,567	6,622	8,978

Marketable Securities (Tables)

12 Months Ended

Dec. 29, 2018

Investments, Debt and Equity Securities [Abstract]

Schedule of Composition of Marketable Securities

The following table summarizes the remaining maturities of our Short-term marketable securities at fair value:



(In thousands)	December 29, 2018		December 30, 2017
Short-term marketable securities:
Maturing within one year	$	7,454	$	4,982
Maturing between one and two years	2,170		—
Total marketable securities	$	9,624	$	4,982

Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 29, 2018

Fair Value Disclosures [Abstract]

Schedule of Fair Value of Financial Instruments



	Fair value measurements as of								Fair value measurements as of
	December 29, 2018								December 30, 2017
(In thousands)	Total		Level 1		Level 2		Level 3		Total		Level 1		Level 2		Level 3
Short-term marketable securities	$	9,624	$	9,624	$	—	$	—	$	4,982	$	4,982	$	—	$	—
Foreign currency forward exchange contracts, net	53		—		53		—		77		—		77		—
Total fair value of financial instruments	$	9,677	$	9,624	$	53	$	—	$	5,059	$	4,982	$	77	$	—

- Definition

Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances.

+ References + Details

Inventories (Tables)

12 Months Ended

Dec. 29, 2018

Inventory Disclosure [Abstract]

Schedule of Inventories



(In thousands)	December 29, 2018		December 30, 2017
Work in progress	$	47,224	$	49,642
Finished goods	19,872		30,261
Total inventories	$	67,096	$	79,903

Property and Equipment (Tables)

12 Months Ended

Dec. 29, 2018

Property, Plant and Equipment [Abstract]

Schedule of Property and Equipment



(In thousands)	December 29, 2018			December 30, 2017
Production equipment and software	160,979			155,492
Leasehold improvements	12,648			13,277
Office furniture and equipment	2,623			2,914
	176,250			171,683
Accumulated depreciation and amortization	(141,367		)	(131,260		)
	$	34,883		$	40,423

Intangible Assets (Tables)

12 Months Ended

Dec. 29, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Finite-Lived Intangible Assets

The following tables summarize the details of our Intangible assets, net as of December 29, 2018 and December 30, 2017:



	December 29, 2018
(In thousands)	Weighted Average Amortization Period (in years)	Gross		Impairment			Accumulated Amortization			Intangible assets, net
Developed technology	5.0	$	112,269	$	(12,486	)	$	(83,185	)	$	16,598
Customer relationships	5.8	22,934		—			(19,048		)	3,886
Licensed technology	5.0	1,195		—			(354		)	841
Total identified intangible assets		$	136,398	$	(12,486	)	$	(102,587	)	$	21,325



	December 30, 2017
(In thousands)	Weighted Average Amortization Period (in years)	Gross		Impairment			Accumulated Amortization			Intangible assets, net
Developed technology	4.7	$	158,700	$	(32,431	)	$	(81,847	)	$	44,422
Customer relationships	5.7	22,934		—			(16,696		)	6,238
Licensed technology	3.5	2,392		—			(1,744		)	648
Total identified intangible assets		$	184,026	$	(32,431	)	$	(100,287	)	$	51,308

Finite-lived Intangible Assets Amortization Expense

We recorded amortization expense related to intangible assets on the Consolidated Statements of Operations as presented in the following table:



	Year Ended
(In thousands)	December 29, 2018		December 30, 2017		December 31, 2016
Research and development	$	277	$	569	$	745
Amortization of acquired intangible assets	17,690		31,340		33,575
	$	17,967	$	31,909	$	34,320

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

The annual expected amortization expense of acquired intangible assets is as follows:



(In thousands)	Amount
2019	13,613
2020	4,499
2021	2,239
2022	238
Thereafter	736
Total	$	21,325

Cost Method Investment and Collaborative Arrangement (Tables)

12 Months Ended

Dec. 29, 2018

Investments, All Other Investments [Abstract]

Schedule of Impairment Adjustments Against Cost Method Investments

The following table summarizes the impairment adjustments against this investment that we have recognized through Other (expense) income, net in the Consolidated Statements of Operations during the fiscal years presented:



	Year Ended
(In thousands)	December 29, 2018			December 30, 2017			December 31, 2016
Impairment of cost-basis investment	$	(266	)	$	(1,761	)	$	(1,459	)

Schedule of Cost Method Investments

The net balance of our investment included in Other long-term assets in the Consolidated Balance Sheets is detailed in the following table:



(In thousands)	Total
Balance at December 31, 2016	$	4,049
Impairment of cost-basis investment	(1,761		)
Balance at December 30, 2017	2,288
Impairment of cost-basis investment	(266		)
Balance at December 29, 2018	$	2,022

Accounts Payable and Accrued Expenses (Tables)

12 Months Ended

Dec. 29, 2018

Payables and Accruals [Abstract]

Schedule of Accounts Payable and Accrued Liabilities

Included in Accounts payable and accrued expenses in the Consolidated Balance Sheets are the following balances:



(In thousands)	December 29, 2018		December 30, 2017
Trade accounts payable	$	31,880	$	35,350
Liability for non-cancelable contracts	6,078		7,232
Restructuring	4,220		2,088
Other accrued expenses	9,585		9,735
Total accounts payable and accrued expenses	$	51,763	$	54,405

Lease Obligations (Tables)

12 Months Ended

Dec. 29, 2018

Leases [Abstract]

Operating Leases of Lessee Disclosure

Future minimum lease commitments at December 29, 2018 are as follows:



Fiscal year	Amount
(In thousands)	Amount
2019	$	7,090
2020	6,893
2021	5,452
2022	4,658
2023	4,229
Thereafter	9,930
	$	38,252

Income Taxes (Tables)

12 Months Ended

Dec. 29, 2018

Income Tax Disclosure [Abstract]

Schedule of Income before Income Tax, Domestic and Foreign

The domestic and foreign components of loss before income taxes were as follows:



	Year Ended
(In thousands)	December 29, 2018			December 30, 2017			December 31, 2016
Domestic	$	(8,274	)	$	(17,341	)	$	(33,962	)
Foreign	(15,695		)	(52,372		)	(10,220		)
Loss before taxes	$	(23,969	)	$	(69,713	)	$	(44,182	)

Schedule of Components of Income Tax Expense (Benefit)

The components of the income tax expense are as follows:



	Year Ended
(In thousands)	December 29, 2018			December 30, 2017		December 31, 2016
Current:
Federal	$	536		$	508	$	1,896
State	38			30		13
Foreign	1,869			304		7,918
	2,443			842		9,827
Deferred:
Federal	—			—		—
State	—			—		—
Foreign	(90		)	7		90
	(90		)	7		90
Income tax expense	$	2,353		$	849	$	9,917

Schedule of Effective Income Tax Rate Reconciliation

Income tax expense differs from the amount of income tax determined by applying the applicable U.S. statutory federal income tax rate to pretax income as a result of the following differences:



	Year Ended
	December 29, 2018	December 30, 2017	December 31, 2016
	%	%	%
Statutory federal rate	(21)	(35)	(35)
Adjustments for tax effects of:
State taxes, net	(6)	(7)	7
Research and development credits	(5)	(1)	(2)
Stock compensation	8	3	3
Foreign rate differential	20	28	15
Foreign dividends	—	1	—
Foreign withholding taxes	5	—	9
Other permanent	2	—	3
Other deferred tax asset adjustment	13	—	—
Valuation allowance	(11)	(73)	17
Change in uncertain tax benefit accrual	2	1	5
Stock compensation (ASU 2016-09) adoption	—	(8)	—
Tax rate change	—	93	—
Other	3	(1)	1
Effective income tax rate	10	1	23

Schedule of Deferred Tax Assets and Liabilities

The components of our net deferred tax assets are as follows:



(In thousands)	December 29, 2018			December 30, 2017
Deferred tax assets:
Accrued expenses and reserves	$	3,714		$	3,096
Inventory	2			2
Deferred Revenue	—			228
Stock-based and deferred compensation	2,660			4,018
Interest expense disallowance	1,283			—
Intangible assets	14,649			19,576
Fixed assets	281			216
Net operating loss carry forwards	88,333			86,410
Tax credit carry forwards	92,208			90,530
Capital loss carry forwards	5,007			3,926
Other	1,130			2,323
Total deferred tax assets	209,267			210,325
Less: valuation allowance	(207,108		)	(209,691		)
Net deferred tax assets	2,159			634
Deferred tax liabilities:
Fixed assets	1,536			559
Deferred revenue	525			—
Other	(57		)	16
Total deferred tax liabilities	2,004			575
Net deferred tax assets	$	155		$	59

Schedule of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns Roll Forward

The following table summarizes the changes to unrecognized tax benefits for fiscal years 2018, 2017 and 2016:



(In thousands)	Amount
Balance at January 2, 2016	$	48,207
Additions based on tax positions related to the current year	2,573
Additions based on tax positions of prior years	530
Reduction for tax positions of prior years	(1,824		)
Reduction as a result of lapse of applicable statute of limitations	(1,863		)
Balance at December 31, 2016	47,623
Additions based on tax positions related to the current year	471
Additions based on tax positions of prior years	11
Reductions for tax positions of prior years	(1,226		)
Reduction as a result of lapse of applicable statute of limitations	(2,047		)
Balance at December 30, 2017	44,832
Additions based on tax positions related to the current year	389
Additions based on tax positions of prior years	19
Reductions for tax positions of prior years	(5		)
Reduction as a result of lapse of applicable statute of limitations	(1,235		)
Balance at December 29, 2018	$	44,000

Restructuring (Tables)

12 Months Ended

Dec. 29, 2018

Restructuring and Related Activities [Abstract]

Schedule of Restructuring Reserve by Type of Cost

The following table displays the activity related to the restructuring plans described above:



(In thousands)	Severance & Related (1)			Lease Termination			Software Contracts & Engineering Tools (2)			Other See note (3) for 2018			Total
Balance at January 2, 2016	$	3,696		$	1,005		$	377		$	—		$	5,078
Restructuring charges	2,883			2,993			1,903			1,488			9,267
Costs paid or otherwise settled	(5,778		)	(2,962		)	(2,255		)	(1,476		)	(12,471		)
Balance at December 31, 2016	$	801		$	1,036		$	25		$	12		$	1,874
Restructuring charges	2,484			811			3,066			835			7,196
Costs paid or otherwise settled	(2,093		)	(977		)	(2,731		)	(822		)	(6,623		)
Balance at December 30, 2017	$	1,192		$	870		$	360		$	25		$	2,447
Restructuring charges	5,696			7,379			913			3,361			17,349
Costs paid or otherwise settled	(5,074		)	381			(1,055		)	(3,368		)	(9,116		)
Balance at December 29, 2018	$	1,814		$	8,630		$	218		$	18		$	10,680



(1)	Includes employee relocation costs and accelerated stock compensation
(2)	Includes cancellation of contracts, asset impairments, and accelerated depreciation on certain enterprise resource planning and customer relationship management systems
(3)	In fiscal 2018, "Other" activity includes the abandonment of long lived assets related to the restructuring of our agreements with a privately-held investee

Long-Term Debt (Tables)

12 Months Ended

Dec. 29, 2018

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

The fair value of the Term Loan approximates the carrying value, which is reflected in our Consolidated Balance Sheets as follows:



(in thousands)	December 29, 2018			December 30, 2017
Principal amount	$	263,033		$	306,791
Unamortized original issue discount and debt issuance costs	(3,386		)	(5,616		)
Less: Current portion of long-term debt	(8,290		)	(1,508		)
Long-term debt	$	251,357		$	299,667

Interest Income and Interest Expense Disclosure

Interest expense related to the Term Loan was included in Interest expense on the Consolidated Statements of Operations as follows:



			Year Ended
(in thousands)	December 29, 2018		December 30, 2017		December 31, 2016
Contractual interest	$	18,600	$	16,503	$	18,518
Amortization of debt issuance costs and discount	2,230		1,982		1,350
Total Interest expense related to the Term Loan	$	20,830	$	18,485	$	19,868

Future principal payments

As of December 29, 2018, expected future principal payments on the Term Loan were as follows:



Fiscal year	(in thousands)

2019	10,031
2020	63,131
2021	189,871
	$	263,033

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

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+ Details

Stock-Based Compensation Plans (Tables)

12 Months Ended

Dec. 29, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Stock-Based Compensation Expense

Total stock-based compensation expense included in our Consolidated Statements of Operations is presented in the following table:



	Year Ended
(In thousands)	December 29, 2018		December 30, 2017		December 31, 2016
Cost of products sold	$	940	$	795	$	888
Research and development	4,357		5,245		7,928
Selling, general, and administrative	8,349		6,503		7,397
Total stock-based compensation	$	13,646	$	12,543	$	16,213

Schedule of Share-based Payment Award, Stock Options and Employee Stock Purchase Plan, Valuation Assumptions

The following table summarizes the assumptions used in the valuation of stock option and ESPP compensation:



	Year Ended
	December 29, 2018	December 30, 2017	December 31, 2016
Employee and Director Stock Options
Expected volatility	39.87% to 41.11%	40.96% to 48.01%	44.2% to 50.8%
Risk-free interest rate	2.29% to 2.78%	1.99% to 2.09%	.94% to 2.06%
Expected term (years)	4.08 to 4.25	4.08 to 4.25	4.06 to 4.78
Employee Stock Purchase Plan *
Weighted average expected volatility	36.4%	—%	57.9%
Weighted average risk-free interest rate	1.61%	—%	0.43%
Expected term	6 months	n/a	6 months

* ESPP suspended during fiscal 2017 only

Schedule of Share-based Compensation, Stock Options, Activity

The following table summarizes the activity for our stock options and RSUs with a market or performance condition:



(Shares in thousands)	Unvested		Vested		Total
Balance, December 30, 2017	707		83		790
Granted	788		—		788
Vested	(31	)	31		—
Exercised	—		(104	)	(104	)
Canceled	(555	)	(10	)	(565	)
Balance, December 29, 2018	909		—		909

The following table summarizes our stock option activity and related information for the year ended December 29, 2018:



(Shares and aggregate intrinsic value in thousands)	Shares		Weighted average exercise price		Weighted average remaining contractual term (years)	Aggregate Intrinsic Value
Balance, December 30, 2017	12,939		$	5.76
Granted	843		7.61
Exercised	(4,882	)	5.79
Forfeited or expired	(2,284	)	5.87
Balance, December 29, 2018	6,616		$	5.94
Vested and expected to vest at December 29, 2018	6,616		$	5.94	4.26	$	6,788
Exercisable, December 29, 2018	3,122		$	5.70	2.82	$	3,668

Schedule of Nonvested Restricted Stock Units Activity

The following table summarizes our RSU activity for the year ended December 29, 2018:



(Shares in thousands)	Shares		Weighted average grant date fair value
Balance, December 30, 2017	2,766		$	5.85
Granted	3,498		8.02
Vested	(1,124	)	5.97
Forfeited or expired	(728	)	5.90
Balance, December 29, 2018	4,412		$	7.53

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The following table summarizes the assumptions used in the valuation of stock options and RSUs with a market or performance condition:



	Year Ended
	December 29, 2018	December 30, 2017	December 31, 2016
Executive stock options with a market condition
Expected volatility	n/a	41%	46%
Risk-free interest rate	n/a	1.9%	1.1%
Expected term (years)	n/a	4.5	4.5
Executive RSUs with a market or performance condition
Expected volatility	41.06% to 41.74%	n/a	n/a
Risk-free interest rate	2.71% to 2.87%	n/a	n/a
Expected term (years)	3.00 to 3.16	n/a	n/a

Valuation and Qualifying Accounts (Tables)

12 Months Ended

Dec. 29, 2018

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

Valuation and Qualifying Accounts

The following table displays the activity related to changes in our valuation and qualifying accounts:



(In thousands)	Balance at beginning of period		Charged (Credit) to costs and expenses			Charged (credit) to other accounts			Settlements & write-offs net of recoveries			Balance at end of period
Fiscal year ended December 29, 2018
Valuation allowance for deferred tax assets	209,691		(2,583		)	—			—			207,108
Allowance for doubtful accounts	9,371		1			73			(9,248		)	197
Allowance for warranty expense	255		580			—			(482		)	353
	$	219,317	$	(2,002	)	$	73		$	(9,730	)	$	207,658
Fiscal year ended December 30, 2017
Valuation allowance for deferred tax assets	$	260,687	$	(50,960	)	$	(36	)	$	—		$	209,691
Allowance for doubtful accounts	9,299		3			38			31			9,371
Allowance for warranty expense	352		100			—			(197		)	255
	$	270,338	$	(50,857	)	$	2		$	(166	)	$	219,317
Fiscal year ended December 31, 2016
Valuation allowance for deferred tax assets	$	252,578	$	7,450		$	659		$	—		$	260,687
Allowance for doubtful accounts	621		7,362			2,284			(968		)	9,299
Allowance for warranty expense	370		216			—			(234		)	352
	$	253,569	$	15,028		$	2,943		$	(1,202	)	$	270,338

Segment and Geographic Information (Tables)

12 Months Ended

Dec. 29, 2018

Segment Reporting [Abstract]

Schedule of Revenue by Major Geographic Area

Our revenue by major geographic area, based on ship-to location of the end customer, where available, and ship-to location of distributor otherwise, is presented in the following table:



	Year Ended
(In thousands)	December 29, 2018			December 30, 2017			December 31, 2016
United States:	$	38,585	10%	$	48,315	13%	$	51,752	12%

China*	202,983		51	193,590		50	186,865		44
Europe	45,546		11	44,547		12	59,835		14
Japan	44,033		11	42,286		11	49,080		12
Taiwan	16,124		4	14,846		4	31,322		7
Other Asia*	34,979		9	26,916		7	37,826		9
Other Americas	16,549		4	15,461		4	10,374		3
Total foreign revenue	360,214		90	337,646		87	375,302		88
Total revenue	$	398,799	100%	$	385,961	100%	$	427,054	100%

* During 2017, we realigned our geographic categories to group Hong Kong with China rather than with Other Asia. Prior periods have been

reclassified to match current period presentation.

Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country

Our Property and equipment, net by country at the end of each period was as follows:



(In thousands)	December 29, 2018		December 30, 2017		December 31, 2016
United States	$	27,353	$	30,338	$	30,532

China	2,360		4,632		10,617
Philippines	3,319		3,883		4,928
Taiwan	949		958		2,310
Japan	324		313		637
Other	578		299		457
Total foreign property and equipment, net	7,530		10,085		18,949
Total property and equipment, net	$	34,883	$	40,423	$	49,481

Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 29, 2018

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information

A summary of the Company's consolidated quarterly results of operations is as follows:



	2018											2017 *
(In thousands, except per share data)	Q4			Q3		Q2			Q1			Q4			Q3			Q2			Q1
Revenue	$	95,977		$	101,484	$	102,715		$	98,623		$	95,266		$	91,971		$	94,137		$	104,587
Gross margin	54,306			58,364		50,248			56,521			51,216			53,322			51,209			60,832
Restructuring charges	11,854			90		4,376			1,029			2,483			3,071			1,576			66
Net (loss) income	$	(7,121	)	$	6,974	$	(20,223	)	$	(5,952	)	$	(7,213	)	$	(43,052	)	$	(13,022	)	$	(7,275	)

Net (loss) income per share - basic and diluted	$	(0.05	)	$	0.05	$	(0.16	)	$	(0.05	)	$	(0.06	)	$	(0.35	)	$	(0.11	)	$	(0.06	)

* Results for 2017 are presented in accordance with ASC 605, which was in effect during that fiscal year.

Nature of Operations and Significant Accounting Policies - Derivative Financial Instruments (Details) $ in Thousands	12 Months Ended
	Dec. 29, 2018 USD ($) Contract	Dec. 30, 2017 USD ($) Contract
General Discussion of Derivative Instruments and Hedging Activities [Abstract]
Gain on foreign exchange contracts adjusted to fair value through earnings - less than	$ 100	$ 100
Foreign exchange contracts
General Discussion of Derivative Instruments and Hedging Activities [Abstract]
Total cost of contracts for Japanese yen	$ 1,955	$ 2,204
Number of contracts \| Contract	2	2

Nature of Operations and Significant Accounting Policies - Concentration Risk (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Risks and Uncertainties [Abstract]
Revenue recognized on shipments to distributors	$ 14.1
Allowance for doubtful accounts	0.2	$ 9.4
Accounts receivable, write-offs	$ 9.0
Increase in allowance for doubtful accounts			$ 9.0
Bad debt expense			$ 7.5
Revenue \| Sell-Through Distributors Concentration Risk
Risks and Uncertainties [Abstract]
Concentration risk, percentage	83.00%	77.00%	73.00%
Top Five Customers \| Revenue \| Customer Concentration Risk
Risks and Uncertainties [Abstract]
Concentration risk, percentage	18.00%	26.00%	27.00%
Largest Customer \| Revenue \| Customer Concentration Risk
Risks and Uncertainties [Abstract]
Concentration risk, percentage	6.10%	7.30%	9.90%
Arrow Electronics Inc. \| Revenue \| Sell-Through Distributors Concentration Risk
Risks and Uncertainties [Abstract]
Concentration risk, percentage	29.00%	24.00%	24.00%
Arrow Electronics Inc. \| Trade receivables \| Sell-Through Distributors Concentration Risk
Risks and Uncertainties [Abstract]
Concentration risk, percentage	41.00%	66.00%
Weikeng Group \| Revenue \| Sell-Through Distributors Concentration Risk
Risks and Uncertainties [Abstract]
Concentration risk, percentage	25.00%	27.00%	22.00%
Weikeng Group \| Trade receivables \| Sell-Through Distributors Concentration Risk
Risks and Uncertainties [Abstract]
Concentration risk, percentage	23.00%	0.00%
All others \| Revenue \| Sell-Through Distributors Concentration Risk
Risks and Uncertainties [Abstract]
Concentration risk, percentage	29.00%	26.00%	27.00%

Nature of Operations and Significant Accounting Policies - Property and Equipment (Details)	12 Months Ended
	Dec. 29, 2018
Equipment and software \| Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	3 years
Equipment and software \| Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	5 years
Tools, Dies and Molds \| Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	1 year
Tools, Dies and Molds \| Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	3 years
Building
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	30 years

Nature of Operations and Significant Accounting Policies - Stock-Based Compensation (Details)	12 Months Ended
	Dec. 29, 2018 Period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual terms of options granted	10 years
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual terms of options granted	2 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Contractual terms of options granted	3 years
Performance Shares \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage	0.00%
Performance Shares \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting percentage	250.00%
President and Chief Executive Officer \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of consecutive trailing four-quarter periods for measurement	2

Nature of Operations and Significant Accounting Policies - New Accounting Pronouncements (Details) - Accounting Standards Update 2016-02 $ in Millions	Dec. 30, 2018 USD ($)
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, right-of-use asset	$ 25
Forecast \| Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, liabilities	25
Forecast \| Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, right-of-use asset	30
Operating lease, liabilities	$ 30

Revenue from Contracts with Customers - Additional Information (Details) - USD ($)
$ in Thousands

3 Months Ended

12 Months Ended

Jun. 30, 2018

Dec. 29, 2018

Dec. 30, 2017

Dec. 31, 2016

^[2]

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

Price adjustment measurement period

6 months

Stock rotation as percentage of billings (not to exceed)

5.00%

Royalty revenue periodic adjustment period

3 years

Cumulative effect adjustments

$ 27,401

^[1]

$ (355)

Proceeds from royalties received

$ 6,400

Accumulated deficit

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

Cumulative effect adjustments

27,401

^[1]

$ (355)

Accounting Standards Update 2014-09 | Accumulated deficit

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

Cumulative effect adjustments

27,400

Deferred Distributor Revenues | Accounting Standards Update 2014-09 | Accumulated deficit

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

Cumulative effect adjustments

20,200

Deferred Licensing Revenues | Accounting Standards Update 2014-09 | Accumulated deficit

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

Cumulative effect adjustments

$ 6,600

Minimum

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

Payment term for invoice

30 days

Maximum

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

Payment term for invoice

60 days

[1]

As of the beginning of fiscal 2018, we adopted ASC 606, Revenue from Contracts With Customers, using the modified retrospective transition method. Asa result of this adoption, we recorded a cumulative-effect adjustment to Accumulated deficit, as shown in the table above.

[2]

During the first quarter of fiscal 2017, we early adopted ASU 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory.This guidance is required to be applied on a modified retrospective basis through a cumulative-effect adjustment to the balance sheet as of the beginningof the fiscal year of adoption. As a result of this adoption, we recorded a nominal amount to Accumulated deficit, as detailed in the table above.

Revenue from Contracts with Customers - Schedule of New Accounting Standard Impact on Financial Statements (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Consolidated Statement of Operations
Revenues	$ 95,977	$ 101,484	$ 102,715	$ 98,623	$ 95,266	$ 91,971	$ 94,137	$ 104,587	$ 398,799	$ 385,961	$ 427,054
Net loss	$ (7,121)	$ 6,974	$ (20,223)	$ (5,952)	$ (7,213)	$ (43,052)	$ (13,022)	$ (7,275)	$ (26,322)	$ (70,562)	$ (54,099)
Net loss per share, basic and diluted (in dollars per share)	$ (0.05)	$ 0.05	$ (0.16)	$ (0.05)	$ (0.06)	$ (0.35)	$ (0.11)	$ (0.06)	$ (0.21)	$ (0.58)	$ (0.45)
Consolidated Balance Sheets
Accounts receivable, net of allowance for doubtful accounts	$ 60,890				$ 55,104				$ 60,890	$ 55,104
Inventories	67,096				79,903				67,096	79,903
Prepaid expenses and other current assets	27,762				16,567				27,762	16,567
Total assets	623,687				635,961				623,687	635,961
Accounts payable and accrued expenses (includes restructuring)	51,763				54,405				51,763	54,405
Deferred income and allowances on sales to distributors	0								0
Accumulated deficit	(476,783)				(477,862)				(476,783)	(477,862)
Total liabilities and stockholders' equity	623,687				635,961				623,687	635,961
Consolidated Statement of Cash Flows
Net loss	(7,121)	$ 6,974	$ (20,223)	$ (5,952)	(7,213)	$ (43,052)	$ (13,022)	$ (7,275)	(26,322)	(70,562)	$ (54,099)
Accounts receivable, net									(3,978)	44,613	(11,419)
Inventories									13,177	(902)	(3,272)
Prepaid expenses and other assets									(11,667)	889	(2,270)
Accounts payable and accrued expenses (includes restructuring)									13,325	(23,588)	8,338
Adjustments \| Accounting Standards Update 2014-09
Consolidated Statement of Operations
Net loss									$ (9,177)
Net loss per share, basic and diluted (in dollars per share)									$ (0.07)
Consolidated Balance Sheets
Accounts receivable, net of allowance for doubtful accounts	6,600								$ 6,600
Inventories	78								78
Prepaid expenses and other current assets	(9,775)								(9,775)
Total assets	(3,097)								(3,097)
Accounts payable and accrued expenses (includes restructuring)	(1,156)								(1,156)
Deferred income and allowances on sales to distributors	34,637								34,637
Accumulated deficit	(36,578)								(36,578)
Total liabilities and stockholders' equity	(3,097)								(3,097)
Consolidated Statement of Cash Flows
Net loss									(9,177)
Accounts receivable, net									(8,408)
Inventories									(448)
Prepaid expenses and other assets									2,260
Accounts payable and accrued expenses (includes restructuring)									(1,614)
Pro forma as if previous standard was in effect
Consolidated Statement of Operations
Net loss									$ (35,499)
Net loss per share, basic and diluted (in dollars per share)									$ (0.28)
Consolidated Balance Sheets
Accounts receivable, net of allowance for doubtful accounts	67,490								$ 67,490
Inventories	67,174								67,174
Prepaid expenses and other current assets	17,987								17,987
Total assets	620,590								620,590
Accounts payable and accrued expenses (includes restructuring)	50,607								50,607
Deferred income and allowances on sales to distributors	34,637								34,637
Accumulated deficit	(513,361)								(513,361)
Total liabilities and stockholders' equity	620,590								620,590
Consolidated Statement of Cash Flows
Net loss									(35,499)
Accounts receivable, net									(12,386)
Inventories									12,729
Prepaid expenses and other assets									(9,407)
Accounts payable and accrued expenses (includes restructuring)									11,711
Product
Consolidated Statement of Operations
Revenues									380,468	356,502	390,704
Cost of product revenue									179,101	164,657	179,983
Consolidated Balance Sheets
Deferred income and allowances on sales to distributors	0				17,250				0	17,250
Consolidated Statement of Cash Flows
Deferred income and allowances on sales to distributors									0	(15,007)	14,391
Product \| Adjustments \| Accounting Standards Update 2014-09
Consolidated Statement of Operations
Revenues									(14,098)
Cost of product revenue									(6,399)
Consolidated Statement of Cash Flows
Deferred income and allowances on sales to distributors									17,387
Product \| Pro forma as if previous standard was in effect
Consolidated Statement of Operations
Revenues									366,370
Cost of product revenue									172,702
Consolidated Statement of Cash Flows
Deferred income and allowances on sales to distributors									17,387
Licensing and services
Consolidated Statement of Operations
Revenues									18,331	29,459	36,350
Cost of product revenue									259	4,725	637
Consolidated Balance Sheets
Deferred income and allowances on sales to distributors	$ 0				$ 68				0	68
Consolidated Statement of Cash Flows
Deferred income and allowances on sales to distributors									(68)	$ (495)	$ (183)
Licensing and services \| Adjustments \| Accounting Standards Update 2014-09
Consolidated Statement of Operations
Revenues									(1,478)
Licensing and services \| Pro forma as if previous standard was in effect
Consolidated Statement of Operations
Revenues									$ 16,853

Revenue from Contracts with Customers - Activity of Contract Assets (Details) $ in Thousands	12 Months Ended
	Dec. 29, 2018 USD ($)
Movement In Contract With Customer, Asset, Net [Roll Forward]
Beginning balance	$ 7,515
Revenues recorded during the period	11,618
Transferred to accounts receivable or collected	(9,990)
Ending balance	$ 9,143

Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 95,977	$ 101,484	$ 102,715	$ 98,623	$ 95,266	$ 91,971	$ 94,137	$ 104,587	$ 398,799	$ 385,961	$ 427,054
Asia
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers									298,119	277,638	305,093
Europe
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers									45,546	44,547	59,835
Americas
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers									55,134	63,776	62,126
Product revenue - Distributors
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers									330,719	297,736	310,163
Product revenue - Direct
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers									49,749	58,766	80,541
Licensing and services revenue
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers									$ 18,331	$ 29,459	$ 36,350

Net Loss per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Net loss	$ (7,121)	$ 6,974	$ (20,223)	$ (5,952)	$ (7,213)	$ (43,052)	$ (13,022)	$ (7,275)	$ (26,322)	$ (70,562)	$ (54,099)
Shares used in basic and diluted net loss per share (in shares)									126,564	122,677	119,994
Basic and diluted net loss per share (in dollars per share)	$ (0.05)	$ 0.05	$ (0.16)	$ (0.05)	$ (0.06)	$ (0.35)	$ (0.11)	$ (0.06)	$ (0.21)	$ (0.58)	$ (0.45)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of EPS (in shares)									7,567	6,622
Stock options, RSU's and ESPP shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of EPS (in shares)											8,978

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Marketable Securities (Details) - USD ($) $ in Thousands	12 Months Ended
Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 29, 2018	Dec. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Term of maturities of investments considered short-term	2 years
Maturing within one year	$ 7,454	$ 4,982
Maturing between one and two years	2,170	0
Total marketable securities	$ 9,624	$ 4,982

Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Short-term marketable securities	$ 9,624	$ 4,982
Unrealized gain (loss)	100	(100)
Fair Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Short-term marketable securities	9,624	4,982
Foreign currency forward exchange contracts, net	53	77
Total fair value of financial instruments	9,677	5,059
Fair Value \| Level 1
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Short-term marketable securities	9,624	4,982
Foreign currency forward exchange contracts, net	0	0
Total fair value of financial instruments	9,624	4,982
Fair Value \| Level 2
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Short-term marketable securities	0	0
Foreign currency forward exchange contracts, net	53	77
Total fair value of financial instruments	53	77
Fair Value \| Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Short-term marketable securities	0	0
Foreign currency forward exchange contracts, net	0	0
Total fair value of financial instruments	$ 0	$ 0

Inventories (Details) - USD ($) $ in Thousands	12 Months Ended
Inventories (Details) - USD ($) $ in Thousands	Dec. 29, 2018	Dec. 30, 2017
Inventory Disclosure [Abstract]
Work in progress	$ 47,224	$ 49,642
Finished goods	19,872	30,261
Total inventories	67,096	$ 79,903
Discontinued Operations \| Millimeter Wave Business
Inventory [Line Items]
Inventory write-down	$ 8,000

Property and Equipment (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
Property and Equipment (Details) - USD ($) $ in Thousands	Aug. 31, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment, gross		$ 176,250	$ 171,683
Accumulated depreciation and amortization		(141,367)	(131,260)
Property and equipment, net		34,883	40,423	$ 49,481
Depreciation expense		13,400	16,300	18,400
Proceeds from sale of building		0	7,895	0
Gain on sale of building		0	4,624	$ 0
Production equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross		160,979	155,492
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross		12,648	13,277
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross		2,623	$ 2,914
Buildings \| Shanghai, China
Property, Plant and Equipment [Line Items]
Accumulated depreciation and amortization	$ (1,400)
Property and equipment, net	3,600
Proceeds from sale of building	7,900
Direct selling costs	1,100
Gain on sale of building	$ 4,600
Restructuring
Property, Plant and Equipment [Line Items]
Depreciation expense		$ 600

Discontinuation of Business Unit, Sales of Assets and Business Units, and Goodwill (Details) - USD ($)		1 Months Ended	3 Months Ended									12 Months Ended
	Sep. 30, 2017	Apr. 30, 2016	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Oct. 01, 2016	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Discontinuation of Business Unit
Nonoperating expense												$ 401,919,000	$ 433,581,000	$ 453,753,000
Impairment of acquired intangible assets				$ 600,000	$ 11,900,000						$ 7,900,000	12,486,000	32,431,000	7,866,000
Restructuring charges			$ 11,854,000	$ 90,000	$ 4,376,000	$ 1,029,000	$ 2,483,000	$ 3,071,000	$ 1,576,000	$ 66,000		17,349,000	7,196,000	9,267,000
Sales of Assets and Business Units
Note receivable resulting from sale of assets and business units			$ 0				$ 3,050,000					0	3,050,000	0
Gain (loss) on sale of assets and business units												0	(1,496,000)	2,646,000
Proceeds from sale of assets and business units, net of cash sold												0	967,000	1,972,000
Goodwill [Abstract]
Goodwill impairment												0	0	0
Product
Discontinuation of Business Unit
Cost of product revenue												179,101,000	$ 164,657,000	$ 179,983,000
Millimeter Wave Business \| Discontinued Operations
Discontinuation of Business Unit
Nonoperating expense												24,100,000
Impairment of acquired intangible assets												11,900,000
Restructuring charges												4,200,000
Millimeter Wave Business \| Discontinued Operations \| Product
Discontinuation of Business Unit
Cost of product revenue												$ 8,000,000
Hyderabad, India subsidiary and assets related to Simplay Labs testing and certification business \| Disposed of by Sale
Sales of Assets and Business Units
Consideration of disposed group	$ 5,300,000							5,300,000
Cash received from sale of business unit	2,300,000
Note receivable resulting from sale of assets and business units	$ 3,000,000							3,000,000
Gain (loss) on sale of assets and business units								(1,800,000)
Goodwill [Abstract]
Disposal of goodwill								$ 2,200,000
Hyderabad \| Disposed of by Sale
Sales of Assets and Business Units
Ownership percentage	100.00%							100.00%
Qterics \| Disposed of by Sale
Sales of Assets and Business Units
Gain (loss) on sale of assets and business units		$ 2,600,000
Proceeds from sale of assets and business units, net of cash sold		$ 2,000,000							$ 300,000

Intangible Assets - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended					12 Months Ended
	Sep. 29, 2018	Jun. 30, 2018	Sep. 30, 2017	Apr. 01, 2017	Oct. 01, 2016	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Impairment of acquired intangible assets	$ 600	$ 11,900			$ 7,900	$ 12,486	$ 32,431	$ 7,866
Developed technology
Finite-Lived Intangible Assets [Line Items]
Impairment of acquired intangible assets						12,486	32,431
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Impairment of acquired intangible assets						$ 0	0
Patents
Finite-Lived Intangible Assets [Line Items]
Proceeds from sale of intangible assets				$ 18,000
Decrease of intangible assets							3,500
Silicon Image, Inc \| Developed technology
Finite-Lived Intangible Assets [Line Items]
Impairment of acquired intangible assets			$ 36,200				$ 32,400
Reduction to preliminary impairment charge			$ 3,800

Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Sep. 29, 2018	Jun. 30, 2018	Oct. 01, 2016	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Intangible assets, gross				$ 136,398	$ 184,026
Impairment	$ (600)	$ (11,900)	$ (7,900)	(12,486)	(32,431)	$ (7,866)
Accumulated Amortization				(102,587)	(100,287)
Intangible assets, net				$ 21,325	$ 51,308
Developed technology
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)				5 years	4 years 8 months 12 days
Intangible assets, gross				$ 112,269	$ 158,700
Impairment				(12,486)	(32,431)
Accumulated Amortization				(83,185)	(81,847)
Intangible assets, net				$ 16,598	$ 44,422
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)				5 years 9 months 22 days	5 years 8 months 11 days
Intangible assets, gross				$ 22,934	$ 22,934
Impairment				0	0
Accumulated Amortization				(19,048)	(16,696)
Intangible assets, net				$ 3,886	$ 6,238
Licensed technology
Finite-Lived Intangible Assets [Line Items]
Weighted Average Amortization Period (in years)				5 years	3 years 6 months
Intangible assets, gross				$ 1,195	$ 2,392
Impairment				0	0
Accumulated Amortization				(354)	(1,744)
Intangible assets, net				$ 841	$ 648

Intangible Assets - Amortization Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets	$ 17,967	$ 31,909	$ 34,320
Research and development
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets	277	569	745
Amortization of acquired intangible assets
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangible assets	$ 17,690	$ 31,340	$ 33,575

Intangible Assets - Schedule of annual expected amortization expense of acquired intangible assets (Details) - USD ($) $ in Thousands	Dec. 29, 2018	Dec. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
2019	$ 13,613
2020	4,499
2021	2,239
2022	238
Thereafter	736
Total	$ 21,325	$ 51,308

Impairment of Acquired Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Sep. 29, 2018	Jun. 30, 2018	Sep. 30, 2017	Oct. 01, 2016	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets	$ 600	$ 11,900		$ 7,900	$ 12,486	$ 32,431	$ 7,866
Developed technology
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets					$ 12,486	32,431
Silicon Image, Inc \| Developed technology
Finite-Lived Intangible Assets [Line Items]
Impairment of intangible assets			$ 36,200			$ 32,400
Reduction to preliminary impairment charge			$ 3,800
Disposal Group, Disposed of by Sale \| Hyderabad
Finite-Lived Intangible Assets [Line Items]
Ownership percentage			100.00%

Cost Method Investment and Collaborative Arrangement (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended	12 Months Ended				48 Months Ended
	Sep. 30, 2017	Jul. 01, 2017	Oct. 01, 2016	Sep. 30, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016	Dec. 29, 2018
Investments, All Other Investments [Abstract]
Payments to acquire cost-method investment			$ 1,000		$ 0	$ 0	$ 1,000	$ 5,000
Ownership interest percentage								22.70%
Gross investments amount			$ 6,000
Short-term loan to cost-method investee	$ 1,000	$ 1,000		$ 2,000	0	2,000	0
Impairment of cost-basis investment					(266)	(1,761)	(1,459)
Decrease of cost method investment									$ 4,000
Movements In Cost Method Investments [Roll Forward]
Beginning balance					2,288	4,049
Impairment of cost-basis investment					(266)	(1,761)	(1,459)
Ending balance					2,022	$ 2,288	$ 4,049		2,022
Prepaid royalties					$ 3,300				$ 3,300

Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 29, 2018	Dec. 30, 2017
Payables and Accruals [Abstract]
Trade accounts payable	$ 31,880	$ 35,350
Liability for non-cancelable contracts	6,078	7,232
Restructuring	4,220	2,088
Other accrued expenses	9,585	9,735
Total accounts payable and accrued expenses	$ 51,763	$ 54,405

Lease Obligations (Details) - USD ($) $ in Thousands	12 Months Ended
Lease Obligations (Details) - USD ($) $ in Thousands	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Leases [Abstract]
Rental expense under operating leases	$ 8,300	$ 8,900	$ 9,500
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2019	7,090
2020	6,893
2021	5,452
2022	4,658
2023	4,229
Thereafter	9,930
Total future minimum lease commitments	$ 38,252

Income Taxes - Domestic and Foreign Components of Loss before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Results of Operations, Income before Income Taxes [Abstract]
Domestic	$ (8,274)	$ (17,341)	$ (33,962)
Foreign	(15,695)	(52,372)	(10,220)
Loss before income taxes	$ (23,969)	$ (69,713)	$ (44,182)

Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Current:
Federal	$ 536	$ 508	$ 1,896
State	38	30	13
Foreign	1,869	304	7,918
Current income tax (provision) benefit	2,443	842	9,827
Deferred:
Federal	0	0	0
State	0	0	0
Foreign	(90)	7	90
Deferred income tax (provision) benefit	(90)	7	90
Income tax expense	$ 2,353	$ 849	$ 9,917

Income Taxes - Reconciliation of Effective Income Tax Rate (Details)	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Statutory federal rate	(21.00%)	(35.00%)	(35.00%)
State taxes, net	(6.00%)	(7.00%)	7.00%
Research and development credits	(5.00%)	(1.00%)	(2.00%)
Stock compensation	8.00%	3.00%	3.00%
Foreign rate differential	20.00%	28.00%	15.00%
Foreign dividends	(0.00%)	1.00%	(0.00%)
Foreign withholding taxes	5.00%	(0.00%)	9.00%
Other permanent	2.00%	(0.00%)	3.00%
Other deferred tax asset adjustment	13.00%	(0.00%)	(0.00%)
Valuation allowance	(11.00%)	(73.00%)	17.00%
Change in uncertain tax benefit accrual	2.00%	1.00%	5.00%
Stock compensation (ASU 2016-09) adoption	(0.00%)	(8.00%)	(0.00%)
Tax rate change	(0.00%)	93.00%	(0.00%)
Other	3.00%	(1.00%)	1.00%
Effective income tax rate	10.00%	1.00%	23.00%

Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Valuation Allowance [Line Items]
Increase (decrease) in valuation allowance	$ (2,600)
Unrecognized tax benefits associated with uncertain tax positions	44,000	$ 44,832	$ 47,623	$ 48,207
Unrecognized tax benefits associated with uncertain tax positions that, if recognized, would affect the effective tax rate	42,000
Interest and penalties associated with unrecognized tax benefits	8,600
Uncertain tax position exposure netted against deferred tax assets	24,900
Amount of unrecognized tax benefit that is reasonably possible be recognized during next twelve months	1,800
Amount of associated interest and penalties could be recognized during next twelve months	100
Federal
Valuation Allowance [Line Items]
Operating loss carryforwards	365,300
Tax credit carryforwards	51,500
State
Valuation Allowance [Line Items]
Operating loss carryforwards	147,600
Tax credit carryforwards	61,200
Do not expire \| State
Valuation Allowance [Line Items]
Tax credit carryforwards	60,200
Other long-term liabilities
Valuation Allowance [Line Items]
Liability for uncertain tax positions	$ 26,300	$ 26,900

Income Taxes - Components of Net Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 29, 2018	Dec. 30, 2017
Deferred tax assets:
Accrued expenses and reserves	$ 3,714	$ 3,096
Inventory	2	2
Deferred Revenue	0	228
Stock-based and deferred compensation	2,660	4,018
Interest expense disallowance	1,283	0
Intangible assets	14,649	19,576
Fixed assets	281	216
Net operating loss carry forwards	88,333	86,410
Tax credit carry forwards	92,208	90,530
Capital loss carry forwards	5,007	3,926
Other	1,130	2,323
Total deferred tax assets	209,267	210,325
Less: valuation allowance	(207,108)	(209,691)
Net deferred tax assets	2,159	634
Deferred tax liabilities:
Fixed assets	1,536	559
Deferred revenue	525	0
Other	(57)	16
Total deferred tax liabilities	2,004	575
Net deferred tax assets	$ 155	$ 59

Income Taxes - Summary of Changes to Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	$ 44,832	$ 47,623	$ 48,207
Additions based on tax positions related to the current year	389	471	2,573
Additions based on tax positions of prior years	19	11	530
Reduction for tax positions of prior years	(5)	(1,226)	(1,824)
Reduction as a result of lapse of applicable statute of limitations	(1,235)	(2,047)	(1,863)
Ending balance	$ 44,000	$ 44,832	$ 47,623

Restructuring - Additional Information (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 11,854,000	$ 90,000	$ 4,376,000	$ 1,029,000	$ 2,483,000	$ 3,071,000	$ 1,576,000	$ 66,000	$ 17,349,000	$ 7,196,000	$ 9,267,000
Restructuring charges									17,349,000	7,196,000	9,267,000
December 2018 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring cost incurred to date	4,800,000								4,800,000
June 2018 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring cost incurred to date	4,200,000								4,200,000
June 2017 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring cost incurred to date	16,400,000								16,400,000
Restructuring charges									8,400,000	8,000,000
September 2015 Reduction
Restructuring Cost and Reserve [Line Items]
Restructuring cost incurred to date	7,200,000								7,200,000
Restructuring charges									0	(700,000)	2,000,000
March 2015 Plan
Restructuring Cost and Reserve [Line Items]
Restructuring cost incurred to date	20,500,000								20,500,000
Restructuring charges									0	(100,000)	7,300,000
Minimum \| June 2017 Plan
Restructuring Cost and Reserve [Line Items]
Total expected restructuring cost	21,500,000								21,500,000
Maximum \| June 2017 Plan
Restructuring Cost and Reserve [Line Items]
Total expected restructuring cost	$ 23,000,000								23,000,000
Hyderabad \| Disposed of by Sale
Restructuring Cost and Reserve [Line Items]
Ownership percentage						100.00%
Lease Termination
Restructuring Cost and Reserve [Line Items]
Restructuring charges									$ 7,379,000	$ 811,000	$ 2,993,000
Lease Termination \| June 2017 Plan
Restructuring Cost and Reserve [Line Items]
Percentage of facility vacated	50.00%
Restructuring charges	$ 6,900,000

Restructuring - Activity Related to Restructuring Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Restructuring Reserve [Roll Forward]
Beginning Balance	$ 2,447	$ 1,874	$ 5,078
Restructuring charges	17,349	7,196	9,267
Costs paid or otherwise settled	(9,116)	(6,623)	(12,471)
Ending Balance	10,680	2,447	1,874
Severance and related
Restructuring Reserve [Roll Forward]
Beginning Balance	1,192	801	3,696
Restructuring charges	5,696	2,484	2,883
Costs paid or otherwise settled	(5,074)	(2,093)	(5,778)
Ending Balance	1,814	1,192	801
Lease Termination
Restructuring Reserve [Roll Forward]
Beginning Balance	870	1,036	1,005
Restructuring charges	7,379	811	2,993
Costs paid or otherwise settled	381	(977)	(2,962)
Ending Balance	8,630	870	1,036
Software Contracts & Engineering Tools
Restructuring Reserve [Roll Forward]
Beginning Balance	360	25	377
Restructuring charges	913	3,066	1,903
Costs paid or otherwise settled	(1,055)	(2,731)	(2,255)
Ending Balance	218	360	25
Other
Restructuring Reserve [Roll Forward]
Beginning Balance	25	12	0
Restructuring charges	3,361	835	1,488
Costs paid or otherwise settled	(3,368)	(822)	(1,476)
Ending Balance	$ 18	$ 25	$ 12

Long-Term Debt - Additional Information (Details) - USD ($)		3 Months Ended				12 Months Ended
	Mar. 10, 2015	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 29, 2018	Dec. 30, 2017
Debt Instrument [Line Items]
Principal amount		$ 263,033,000				$ 263,033,000
Annual excess cash flow payments						95 days
Line of Credit \| Term Loan
Debt Instrument [Line Items]
Principal amount	$ 350,000,000
Repayment of debt	346,500,000
Unamortized original issue discount and debt issuance costs	3,500,000	$ 3,386,000				$ 3,386,000	$ 5,616,000
Payments of debt issuance costs	$ 8,300,000
Interest rate, effective percentage		7.30%				7.30%
Quarterly installment payment		$ 900,000	$ 900,000	$ 900,000	$ 900,000	$ 900,000
Percentage of excess cash flow payment required		75.00%				75.00%
Payment of required annual excess cash flow payment				200,000
Debt principal payment		$ 15,000,000	$ 15,000,000	$ 10,000,000
Debt outstanding		$ 263,033,000				$ 263,033,000	$ 306,791,000
Line of Credit \| Term Loan \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt variable interest floor rate						1.00%
Basis spread on variable rate						4.25%
Minimum \| Line of Credit \| Term Loan
Debt Instrument [Line Items]
Percentage of excess cash flow payment required		0.00%				0.00%
Maximum \| Line of Credit \| Term Loan
Debt Instrument [Line Items]
Percentage of excess cash flow payment required		75.00%				75.00%

Long-Term Debt - Schedule of Debt and Interest Expense Related to Term Loan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016	Mar. 10, 2015
Debt Instrument [Line Items]
Contractual interest	$ 18,600	$ 16,503	$ 18,518
Amortization of debt issuance costs and discount	2,230	1,982	1,350
Total Interest expense related to the Term Loan	20,830	18,485	$ 19,868
Line of Credit \| Term Loan
Debt Instrument [Line Items]
Principal amount	263,033	306,791
Unamortized original issue discount and debt issuance costs	(3,386)	(5,616)		$ (3,500)
Less: Current portion of long-term debt	(8,290)	(1,508)
Long-term debt	$ 251,357	$ 299,667

Long-Term Debt - Schedule of Expected Future Principal Payments (Details) $ in Thousands	Dec. 29, 2018 USD ($)
Debt Disclosure [Abstract]
2019	$ 10,031
2020	63,131
2021	189,871
Principal amount	$ 263,033

Stock-Based Compensation Plans - Additional Information (Details)		12 Months Ended
	Mar. 10, 2015 $ / shares shares	Dec. 29, 2018 USD ($) Period plan $ / shares shares	Dec. 30, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares	Jan. 02, 2016 USD ($)	May 31, 2012 shares
Class of Stock [Line Items]
Number of equity incentive plans \| plan		4
Granted, Shares		843,000
Number of shares available for future awards		0
Plan adjustment ratio		2.2
Contractual terms of options granted (do not exceed)		10 years
Compensation expense \| $		$ 13,646,000	$ 12,543,000	$ 16,213,000
Conversion ratio	1.09816
Number of outstanding option (in shares)		6,616,000	12,939,000
Total unrecognized compensation cost related to unvested employee and director stock options \| $		$ 6,800,000
Total intrinsic value of options exercised \| $		6,500,000	$ 2,200,000	3,300,000
Total fair value of options and RSU's vested and expensed \| $		$ 13,000,000	$ 12,500,000	$ 15,600,000
Grant date weighted average fair values based on fair value assumptions, options (in dollars per share) \| $ / shares		$ 2.73	$ 2.02	$ 2.14
Grant date weighted average fair values based on fair assumptions, non-options (in dollars per share) \| $ / shares		$ 1.50		$ 1.82
Chief Executive Officer
Class of Stock [Line Items]
Compensation expense \| $		$ 1,400,000
Executive Officer
Class of Stock [Line Items]
Compensation expense \| $		$ 900,000	$ 500,000	$ 800,000
Maximum
Class of Stock [Line Items]
Contractual terms of options granted (do not exceed)		3 years
Minimum
Class of Stock [Line Items]
Contractual terms of options granted (do not exceed)		2 years
Employee and Director Stock Options
Class of Stock [Line Items]
Award vesting period		4 years
Number of outstanding option (in shares)	2,087,605	76,449
Weighted average period for recognition		2 years 3 months 22 days
Restricted Stock Units (RSUs)
Class of Stock [Line Items]
Award vesting period		4 years
Stock conversion offer price (in dollars per share) \| $ / shares	$ 7.30
Number of outstanding option (in shares)	2,025,255	2,223
Grant date weighted average fair values based on fair assumptions, non-options (in dollars per share) \| $ / shares		$ 8.02
Unrecognized compensation expense related to unvested RSU's \| $		$ 31,600,000
Performance Shares
Class of Stock [Line Items]
Granted, Shares		788,000
Number of outstanding option (in shares)		0	83,000
Performance Shares \| Executive Officer
Class of Stock [Line Items]
Award vesting period		2 years
Award vesting comparison period		2 years
Performance Shares \| President and Chief Executive Officer
Class of Stock [Line Items]
Award vesting period		3 years
Number of consecutive trailing four-quarter periods for measurement \| Period		2
Performance Shares \| Corporate Vice President of Research and Development
Class of Stock [Line Items]
Award vesting period		3 years
Performance Shares \| Maximum
Class of Stock [Line Items]
Award vesting percentage		250.00%
Performance Shares \| Maximum \| Executive Officer
Class of Stock [Line Items]
Award vesting percentage		200.00%
Performance Shares \| Minimum
Class of Stock [Line Items]
Award vesting percentage		0.00%
Performance Shares \| Minimum \| Executive Officer
Class of Stock [Line Items]
Award vesting percentage		0.00%
Performance Shares \| TSR Relative To PHLX Semiconductor Sector Index 50th Percentile Achievement \| President and Chief Executive Officer
Class of Stock [Line Items]
Award vesting percentage		100.00%
Performance Shares \| TSR Relative To PHLX Semiconductor Sector Index 50th Percentile Achievement \| Corporate Vice President of Research and Development
Class of Stock [Line Items]
Award vesting percentage		100.00%
Performance Shares \| TSR Relative To PHLX Semiconductor Sector Index 75th Percentile Achievement \| President and Chief Executive Officer
Class of Stock [Line Items]
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights, Vesting Multiplier		250.00%
Performance Shares \| TSR Relative To PHLX Semiconductor Sector Index 75th Percentile Achievement \| Corporate Vice President of Research and Development
Class of Stock [Line Items]
Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Rights, Vesting Multiplier		200.00%
Performance Shares \| TSR Below 25th Percentile \| President and Chief Executive Officer
Class of Stock [Line Items]
Award vesting percentage		0.00%
2001 Stock Plan
Class of Stock [Line Items]
Granted, Shares		0
2012 ESPP
Class of Stock [Line Items]
Number of shares available for future awards		1,700,000
Number of shares authorized						3,000,000
Percentage of employee's compensation maximum for employee share purchases		10.00%
Purchase price of shares as percentage of fair market value		85.00%
Compensation expense \| $		$ 600,000	$ 0		$ 600,000
2013 Incentive Plan, Inducement Plan and the 2011 Non-Employee Director Equity Incentive Plan
Class of Stock [Line Items]
Number of shares available for future awards		6,100,000
2013 Incentive Plan
Class of Stock [Line Items]
Number of shares transfered out of plan		2,500,000

Stock-Based Compensation Plans - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	$ 13,646	$ 12,543	$ 16,213
Cost of products sold
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	940	795	888
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	4,357	5,245	7,928
Selling, general, and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation	$ 8,349	$ 6,503	$ 7,397

Stock-Based Compensation Plans - Summary of Assumptions Used in Valuation of Stock Option and ESPP Compensation (Details)	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Employee and Director Stock Options
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected volatility, percent, minimum	39.87%	40.96%	44.20%
Expected volatility, percent, maximum	41.11%	48.01%	50.80%
Weighted average risk-free interest rate, percent, minimum	2.29%	1.99%	0.94%
Weighted average risk-free interest rate, percent, maximum	2.78%	2.09%	2.06%
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected term (years)	6 months		6 months
Weighted average expected volatility	36.40%	0.00%	57.90%
Risk-free interest rate	1.61%	0.00%	0.43%
Minimum \| Employee and Director Stock Options
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected term (years)	4 years 28 days	4 years 28 days	4 years 22 days
Maximum \| Employee and Director Stock Options
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected term (years)	4 years 3 months	4 years 3 months	4 years 9 months 10 days

Stock-Based Compensation Plans - Summary of Stock Option Activity (Details) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 29, 2018 USD ($) $ / shares shares
Shares
Beginning balance, Shares \| shares	12,939
Granted, Shares \| shares	843
Exercised, Shares \| shares	(4,882)
Forfeited or expired, Shares \| shares	(2,284)
Ending balance, Shares \| shares	6,616
Vested and expected to vest at end of period, Shares \| shares	6,616
Exercisable at end of period, Shares \| shares	3,122
Weighted average exercise price
Beginning balance (dollars per share) \| $ / shares	$ 5.76
Granted (dollars per share) \| $ / shares	7.61
Exercised (dollars per share) \| $ / shares	5.79
Forfeited or expired (dollars per share) \| $ / shares	5.87
Ending balance (dollars per share) \| $ / shares	5.94
Vested and expected to vest at end of period, Weighted average exercise price (dollars per share) \| $ / shares	5.94
Exercisable at end of period, Weighted average exercise price (dollars per share) \| $ / shares	$ 5.70
Total
Vested and expected to vest at end of period, Weighted average remaining contractual term	4 years 3 months 3 days
Vested and expected to vest at end of period, aggregate intrinsic value \| $	$ 6,788
Exercisable at end of period, Weighted average remaining contractual term	2 years 9 months 26 days
Exercisable at end of period, aggregate intrinsic value \| $	$ 3,668

Stock-Based Compensation Plans - Summary of RSU Activity (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 31, 2016
Weighted average grant date fair value
Granted, Weighted average grant date fair value (dollars per share)	$ 1.50	$ 1.82
Restricted Stock Units (RSUs)
Shares
Balance at the beginning of period, Shares	2,766
Granted, Shares	3,498
Vested, Shares	(1,124)
Forfeited or expired, Shares	(728)
Balance at the end of period, Shares	4,412
Weighted average grant date fair value
Balance at the beginning of period, Weighted average grant date fair value (dollars per share)	$ 5.85
Granted, Weighted average grant date fair value (dollars per share)	8.02
Vested, Weighted average grant date fair value (dollars per share)	5.97
Forfeited or expired, Weighted average grant date fair value (dollars per share)	5.90
Balance at the end of period, Weighted average grant date fair value (dollars per share)	$ 7.53

Stock-Based Compensation Plans - Summary of Stock Options with Market Condition Activity (Details) shares in Thousands	12 Months Ended
	Dec. 29, 2018 shares
Unvested
Granted, Shares	843
Vested
Beginning balance, Shares	12,939
Exercised, Shares	(4,882)
Ending balance, Shares	6,616
Total
Granted, Shares	843
Exercised, Shares	(4,882)
Ending balance, shares	6,616
Performance Shares
Unvested
Beginning balance, Shares	707
Granted, Shares	788
Vested, Shares	(31)
Canceled, Shares	(555)
Ending balance, Shares	909
Vested
Beginning balance, Shares	83
Vested, Shares	31
Exercised, Shares	(104)
Canceled, Shares	(10)
Ending balance, Shares	0
Total
Beginning balance, shares	790
Granted, Shares	788
Exercised, Shares	(104)
Canceled, Shares	(565)
Ending balance, shares	909

Stock-Based Compensation Plans - Summary of Assumptions Used in Valuation of Stock Options and RSUs (Details) - Performance Shares	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility		41.00%	46.00%
Risk-free interest rate		1.90%	1.10%
Expected term (years)		4 years 6 months	4 years 6 months
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	41.06%
Risk-free interest rate	2.71%
Expected term (years)	3 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility	41.74%
Risk-free interest rate	2.87%
Expected term (years)	3 years 1 month 28 days

Employee Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended
Employee Benefit Plans (Details) - USD ($) $ in Millions	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Compensation Related Costs [Abstract]
Employer matching contribution to a 401(k) plan	$ 0.6	$ 0.8	$ 0.9
Cash incentive plan expense	$ 5.9	$ 7.2	$ 4.7

Contingencies (Details) $ in Millions	Dec. 19, 2018 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Loss contingency, damages sought, value	$ 138

Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 219,317	$ 270,338	$ 253,569
Charged (Credit) to costs and expenses	(2,002)	(50,857)	15,028
Charged (credit) to other accounts	73	2	2,943
Settlements & write-offs net of recoveries	(9,730)	(166)	(1,202)
Balance at end of period	207,658	219,317	270,338
Valuation allowance for deferred tax assets
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	209,691	260,687	252,578
Charged (Credit) to costs and expenses	(2,583)	(50,960)	7,450
Charged (credit) to other accounts	0	(36)	659
Settlements & write-offs net of recoveries	0	0	0
Balance at end of period	207,108	209,691	260,687
Allowance for doubtful accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	9,371	9,299	621
Charged (Credit) to costs and expenses	1	3	7,362
Charged (credit) to other accounts	73	38	2,284
Settlements & write-offs net of recoveries	(9,248)	31	(968)
Balance at end of period	197	9,371	9,299
Allowance for warranty expense
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	255	352	370
Charged (Credit) to costs and expenses	580	100	216
Charged (credit) to other accounts	0	0	0
Settlements & write-offs net of recoveries	(482)	(197)	(234)
Balance at end of period	$ 353	$ 255	$ 352

Segment and Geographic Information - Additional Information (Details)	12 Months Ended
	Dec. 29, 2018 segment
Segment Reporting [Abstract]
Number of operating segment	1

Segment and Geographic Information - Revenue by Major Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 95,977	$ 101,484	$ 102,715	$ 98,623	$ 95,266	$ 91,971	$ 94,137	$ 104,587	$ 398,799	$ 385,961	$ 427,054
Total revenue, percent									100.00%	100.00%	100.00%
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									$ 38,585	$ 48,315	$ 51,752
Total revenue, percent									10.00%	13.00%	12.00%
Foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									$ 360,214	$ 337,646	$ 375,302
Total revenue, percent									90.00%	87.00%	88.00%
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									$ 202,983	$ 193,590	$ 186,865
Total revenue, percent									51.00%	50.00%	44.00%
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									$ 45,546	$ 44,547	$ 59,835
Total revenue, percent									11.00%	12.00%	14.00%
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									$ 44,033	$ 42,286	$ 49,080
Total revenue, percent									11.00%	11.00%	12.00%
Taiwan
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									$ 16,124	$ 14,846	$ 31,322
Total revenue, percent									4.00%	4.00%	7.00%
Other Asia
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									$ 34,979	$ 26,916	$ 37,826
Total revenue, percent									9.00%	7.00%	9.00%
Other Americas
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									$ 16,549	$ 15,461	$ 10,374
Total revenue, percent									4.00%	4.00%	3.00%

Segment and Geographic Information - Property and Equipment, Net by Country (Details) - USD ($) $ in Thousands	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	$ 34,883	$ 40,423	$ 49,481
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	27,353	30,338	30,532
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	2,360	4,632	10,617
Philippines
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	3,319	3,883	4,928
Taiwan
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	949	958	2,310
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	324	313	637
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	578	299	457
Foreign
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	$ 7,530	$ 10,085	$ 18,949

Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 29, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 30, 2017	Sep. 30, 2017	Jul. 01, 2017	Apr. 01, 2017	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 95,977	$ 101,484	$ 102,715	$ 98,623	$ 95,266	$ 91,971	$ 94,137	$ 104,587	$ 398,799	$ 385,961	$ 427,054
Gross margin	54,306	58,364	50,248	56,521	51,216	53,322	51,209	60,832
Restructuring charges	11,854	90	4,376	1,029	2,483	3,071	1,576	66	17,349	7,196	9,267
Net (loss) income	$ (7,121)	$ 6,974	$ (20,223)	$ (5,952)	$ (7,213)	$ (43,052)	$ (13,022)	$ (7,275)	$ (26,322)	$ (70,562)	$ (54,099)
Net income (loss) per share, basic and diluted (in dollars per share)	$ (0.05)	$ 0.05	$ (0.16)	$ (0.05)	$ (0.06)	$ (0.35)	$ (0.11)	$ (0.06)	$ (0.21)	$ (0.58)	$ (0.45)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details