Condensed Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2014	Jun. 30, 2013	Jun. 29, 2014	Jun. 30, 2013
Net income (loss)	$ 1,916	$ (3,567)	$ 4,381	$ (13,075)
Other comprehensive income (loss)
Changes in foreign currency translation adjustments	133	326	(483)	(133)
Changes in unrealized investment loss	0	0	0	(29)
Other comprehensive income (loss)	133	326	(483)	(162)
Comprehensive income (loss)	$ 2,049	$ (3,241)	$ 3,898	$ (13,237)