CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands		Total	Common stock	Paid-in capital	Treasury stock	Accumulated deficit	Accumulated other comprehensive loss
Beginning balances (in shares) at Jan. 03, 2015			117,288
Beginning balances at Jan. 03, 2015		$ 440,975	$ 1,173	$ 635,299	$ 0	$ (193,613)	$ (1,884)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss		(159,233)				(159,233)
Unrealized loss related to marketable securities, net of tax		(69)					(69)
Recognized loss on redemption of marketable securities, previously unrealized		442					442
Translation adjustments, net of tax		(1,243)					(1,243)
Common stock issued in connection with the exercise of stock options, ESPP and vested RSUs (in shares)			2,415
Common stock issued in connection with the exercise of stock options, ESPP and vested RSUs, net of tax		2,186	$ 25	2,161
Stock repurchase		(6,970)			(6,970)
Retirement of treasury stock (shares)			(1,052)
Retirement of treasury stock		0	$ (11)	(6,959)	6,970
Stock-based compensation expense related to options, ESPP and RSUs		18,396		18,396
Fair value of partially vested stock options and RSUs assumed in acquisition		5,139		5,139
Defined benefit pension, net of actuarial losses		(156)					(156)
Redemption of noncontrolling interest, net of previous accretion to redemption value.		6,053		6,053
Ending balances (in shares) at Jan. 02, 2016			118,651
Ending balances at Jan. 02, 2016		305,520	$ 1,187	660,089	0	(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 losses		$ 150					150
Ending balances (in shares) at Dec. 31, 2016		121,645	121,645
Ending balances at Dec. 31, 2016		$ 270,430	$ 1,216	680,315	0	(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 losses		$ (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	$ 0	$ (477,862)	$ (1,452)

[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).