Changes in Stockholders' Equity and Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2016	Apr. 04, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 305,520
Net loss for the three months ended April 2, 2016	(19,711)
Unrealized loss related to marketable securities, net of tax	(28)	$ (20)
Recognized loss on redemption of marketable securities, previously unrealized	2	288
Translation adjustments, net of tax	237	$ (6)
Common stock issued in connection with the exercise of stock options, ESPP and vested RSUs, net of tax	592
Stock-based compensation expense related to stock options, ESPP and RSUs	4,556
Ending balance	291,168
Common stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	1,187
Common stock issued in connection with the exercise of stock options, ESPP and vested RSUs, net of tax	4
Ending balance	1,191
Additional Paid-in capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	660,089
Common stock issued in connection with the exercise of stock options, ESPP and vested RSUs, net of tax	588
Stock-based compensation expense related to stock options, ESPP and RSUs	4,556
Ending balance	665,233
Accumulated deficit
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(352,846)
Net loss for the three months ended April 2, 2016	(19,711)
Ending balance	(372,557)
Accumulated other comprehensive loss
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(2,910)
Unrealized loss related to marketable securities, net of tax	(28)
Recognized loss on redemption of marketable securities, previously unrealized	2
Translation adjustments, net of tax	237
Ending balance	$ (2,699)