Condensed Consolidated Statements Of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 29, 2014	Mar. 30, 2013
Net loss	$ (4,521)	$ (8,264)
Other comprehensive income (loss), before tax:
Change in unrealized net gain on available-for-sale investments	5	(15)
Foreign currency translation losses	(31)	(6)
Other comprehensive loss, before tax	(26)	(21)
Income tax provision related to items in other comprehensive loss
Net current-period other comprehensive income (loss)	(26)	(21)
Comprehensive loss	$ (4,547)	$ (8,285)