Computation of Basic and Diluted Net Loss Per Common Share - Reconciliation of Numerator and Denominator of Basic and Diluted Net Loss Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2016	Oct. 03, 2015	Oct. 01, 2016	Oct. 03, 2015
Numerator:
Net (loss) income	$ (671)	$ 442	$ (898)	$ 36
Denominator:
Weighted average shares of common stock (basic)	10,129	9,972	10,083	9,956
Effect of dilutive stock options		117		174
Effect of dilutive contingent shares		5		12
Weighted average shares of common stock (diluted)	10,129	10,094	10,083	10,142
Per share data:
Basic net (loss) income per share	$ (0.07)	$ 0.04	$ (0.09)	$ 0.00
Diluted net (loss) income per share	$ (0.07)	$ 0.04	$ (0.09)	$ 0.00