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. 03, 2021	Apr. 03, 2021	Mar. 28, 2020
Numerator:
Net loss	$ (2,010)	$ (2,010)	$ (1,651)
Denominator:
Weighted average shares of common stock (basic)	14,346		13,786
Weighted average shares of common stock (diluted)	14,346		13,786
Per share data:
Basic net loss per share	$ (0.14)		$ (0.12)
Diluted net loss per share	$ (0.14)		$ (0.12)