Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended				6 Months Ended		9 Months Ended
	Oct. 02, 2016	Jul. 03, 2016	Sep. 27, 2015	Jun. 28, 2015	Jul. 03, 2016	Jun. 28, 2015	Oct. 02, 2016	Sep. 27, 2015
Net income (loss)	$ (2,404)	$ (2,404)	$ (3,202)	$ (3,202)	$ 6,459	$ 1,648	$ 6,459	$ 1,648
Components of other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(212)	(212)	(1,034)	(1,034)	703	(1,899)	703	(1,899)
Comprehensive income (loss)	$ (2,616)	$ (2,616)	$ (4,236)	$ (4,236)	$ 7,162	$ (251)	$ 7,162	$ (251)