CONDENSED UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2016	Sep. 27, 2015	Oct. 02, 2016	Sep. 27, 2015
Statement of Comprehensive Income [Abstract]
Net loss	$ (4,623)	$ (5,086)	$ (15,290)	$ (13,002)
Total other comprehensive income, net of tax	0	0	0	0
Total comprehensive loss	$ (4,623)	$ (5,086)	$ (15,290)	$ (13,002)