Consolidated Statement of Comprehensive Loss (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Apr. 02, 2016	Apr. 04, 2015
Statement of Comprehensive Income [Abstract]
Net loss	$ (19,711)	$ (53,347)
Other comprehensive loss:
Unrealized loss related to marketable securities, net of tax	(28)	(20)
Reclassification adjustment for losses included in other income (expense), net of tax	2	288
Translation adjustment, net of tax	237	(6)
Change in actuarial valuation of defined benefit pension	0	(157)
Comprehensive loss	$ (19,500)	$ (53,242)