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
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Numerator:
Net loss	$ (3,096)	$ (671)	$ (7,712)	$ (898)
Denominator:
Weighted average shares of common stock (basic)	11,569	10,129	11,544	10,083
Weighted average shares of common stock (diluted)	11,569	10,129	11,544	10,083
Per share data:
Basic net loss per share	$ (0.27)	$ (0.07)	$ (0.67)	$ (0.09)
Diluted net loss per share	$ (0.27)	$ (0.07)	$ (0.67)	$ (0.09)