Condensed Consolidated Statements Of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Net loss	$ (2,745)	$ (8,007)	$ (17,421)	$ (12,661)
Other comprehensive income (loss), before tax
Change in unrealized net loss on available-for-sale investments	60	73	(29)	305
Foreign currency translation gains (losses)	3	19	(7)	5
Other comprehensive income (loss), before tax	63	92	(36)	310
Income tax (expense) benefit related to items in other comprehensive income (loss)		(26)		(107)
Other comprehensive income (loss), net of tax	63	66	(36)	203
Comprehensive loss	$ (2,682)	$ (7,941)	$ (17,457)	$ (12,458)