Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common stock	Paid-in capital	Treasury stock	Accumulated deficit	Accumulated other comprehensive loss
Balances (shares) at Dec. 28, 2013		115,671,000
Balances at Dec. 28, 2013	$ 385,680	$ 1,157	$ 626,861	$ 0	$ (242,193)	$ (145)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	48,580				48,580
Unrealized loss related to marketable securities, net of tax	(373)					(373)
Recognized loss on redemption of marketable securities, previously unrealized	170					170
Realized gain on sale of auction rate securities, previously unrealized, net of tax	(1,147)					(1,147)
Translation adjustments, net of tax	(330)					(330)
Common stock issued in connection with the exercise of stock options, ESPP and vested RSUs (net of taxes) (shares)		3,560,000
Common stock issued in connection with the exercise of stock options, ESPP and vested RSUs, net of tax	8,741	$ 35	8,706
Stock repurchase	(13,089)			(13,089)
Retirement of treasury stock (shares)		(1,943,000)
Retirement of treasury stock	0	$ (19)	(13,070)	13,089
Stock-based compensation expense related to options, ESPP and RSUs	12,802		12,802
Change in actuarial valuation of defined benefit pension	(59)					(59)
Balances (shares) at Jan. 03, 2015		117,288,000
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) income	(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
Realized gain on sale of auction rate securities, previously unrealized, net of tax	0
Translation adjustments, net of tax	(1,243)					(1,243)
Common stock issued in connection with the exercise of stock options, ESPP and vested RSUs (net of taxes) (shares)		2,415,000
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)		(1,052,000)
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
Change in actuarial valuation of defined benefit pension	(156)					(156)
Redemption of noncontrolling interest, net of previous accretion to redemption value.	$ 6,053		6,053
Balances (shares) at Jan. 02, 2016	118,651,000	118,651,000
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) income	(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
Realized gain on sale of auction rate securities, previously unrealized, net of tax	0
Translation adjustments, net of tax	(1,303)					(1,303)
Common stock issued in connection with the exercise of stock options, ESPP and vested RSUs (net of taxes) (shares)		2,994,000
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
Change in actuarial valuation of defined benefit pension	$ 150					150
Balances (shares) at Dec. 31, 2016	121,645,000	121,645,000
Balances at Dec. 31, 2016	$ 270,430	$ 1,216	$ 680,315	$ 0	$ (406,945)	$ (4,156)