Condensed Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2013	Sep. 30, 2012	Sep. 29, 2013	Sep. 30, 2012
Net income (loss)	$ (2,262)	$ (2,798)	$ (9,087)	$ (9,755)
Other comprehensive gain (loss), net of tax:
Unrealized gain (loss) on available-for-sale investments	0	(52)	11	(89)
Total comprehensive income (loss)	$ (2,262)	$ (2,850)	$ (9,076)	$ (9,844)