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)			(54,099)
Unrealized loss related to marketable securities, net of tax		(172)				(172)
Recognized loss on redemption of marketable securities, previously unrealized		79				79
Translation adjustments, net of tax		(1,303)				(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		16,213
Defined benefit pension, net of actuarial valuation adjustments		150				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)			(355)
Net loss		(70,562)			(70,562)
Unrealized loss related to marketable securities, net of tax		(73)				(73)
Recognized loss on redemption of marketable securities, previously unrealized		252				252
Translation adjustments, net of tax		2,620				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		12,658
Defined benefit pension, net of actuarial valuation adjustments		$ (95)				(95)
Ending balances (in shares) at Dec. 30, 2017		123,895	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			27,401
Net loss		(26,322)			(26,322)
Unrealized loss related to marketable securities, net of tax		41				41
Recognized loss on redemption of marketable securities, previously unrealized		(18)				(18)
Translation adjustments, net of tax		(1,271)				(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		13,646
Defined benefit pension, net of actuarial valuation adjustments		$ 369				369
Ending balances (in shares) at Dec. 29, 2018		129,728	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.