Condensed Consolidated Statements of Comprehensive (Loss) Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Oct. 03, 2015	Oct. 01, 2016	Oct. 03, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) income	$ (671)	$ 442	$ (898)	$ 36
Comprehensive (loss) income	$ (671)	$ 442	$ (898)	$ 36