Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013
Statement of Comprehensive Income [Abstract]
Net loss	$ (28,662)	$ (4,554)	$ (26,479)	$ (14,702)
Other comprehensive income (loss):
Change in foreign currency translation adjustment	(1,637)	1,142	(1,252)	(837)
Net change on unrealized gains on available-for-sale investments	(15)	20	(7)	17
Other comprehensive income (loss)	(1,652)	1,162	(1,259)	(820)
Comprehensive loss	$ (30,314)	$ (3,392)	$ (27,738)	$ (15,522)