Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net (loss) income	$ (11,713)	$ 474	$ 10,038
Comprehensive (loss) income	$ (11,713)	$ 474	$ 10,038