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		6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Numerator:
Net loss	$ (2,750)	$ (328)	$ (4,616)	$ (227)
Denominator:
Weighted average shares of common stock (basic)	11,546	10,085	11,532	10,060
Weighted average shares of common stock (diluted)	11,546	10,085	11,532	10,060
Per share data:
Basic net loss per share	$ (0.24)	$ (0.03)	$ (0.40)	$ (0.02)
Diluted net loss per share	$ (0.24)	$ (0.03)	$ (0.40)	$ (0.02)