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
	Apr. 01, 2017	Apr. 02, 2016
Numerator:
Net (loss) income	$ (1,866)	$ 101
Denominator:
Weighted average shares of common stock (basic)	11,518	10,034
Effect of dilutive stock options		86
Effect of dilutive contingent shares		20
Weighted average shares of common stock (diluted)	11,518	10,140
Per share data:
Basic net (loss) income per share	$ (0.16)	$ 0.01
Diluted net (loss) income per share	$ (0.16)	$ 0.01