Computation of Basic and Diluted Net Income Per Common Share - Reconciliation of Numerator and Denominator of Basic and Diluted Net Income Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2015	Jun. 28, 2014	Jul. 04, 2015	Jun. 28, 2014
Numerator:
Net (loss) income	$ (652)	$ 297	$ (406)	$ 784
Denominator:
Weighted average shares of common stock (basic)	10,027	9,922	9,948	9,943
Effect of dilutive stock options		312		341
Effect of dilutive contingent shares		177		185
Weighted average shares of common stock (diluted)	10,027	10,411	9,948	10,469
Per share data:
Basic (loss) income per share	$ (0.07)	$ 0.03	$ (0.04)	$ 0.08
Diluted (loss) income per share	$ (0.07)	$ 0.03	$ (0.04)	$ 0.07