Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 1,344	$ 588	$ 3,900	$ 2,183
Other comprehensive income (loss):
Change in foreign currency translation adjustment	(18)	174	(1,745)	385
Net change on unrealized gains on available-for-sale investments	(4)	8	25	8
Other comprehensive income (loss)	(22)	182	(1,720)	393
Comprehensive income	$ 1,322	$ 770	$ 2,180	$ 2,576