CONDENSED UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2016	Jun. 28, 2015	Jul. 03, 2016	Jun. 28, 2015
Statement of Comprehensive Income [Abstract]
Net loss	$ (5,574)	$ (4,278)	$ (10,667)	$ (7,916)
Total other comprehensive income, net of tax	0	0	0	0
Total comprehensive loss	$ (5,574)	$ (4,278)	$ (10,667)	$ (7,916)