Computation of Basic and Diluted Net Loss 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	12 Months Ended
	Jan. 02, 2021	Dec. 28, 2019
Numerator:
Net loss	$ (6,329)	$ (8,813)
Denominator:
Weighted average shares of common stock (basic)	13,842	13,707
Weighted average shares of common stock (diluted)	13,842	13,707
Per share data:
Basic net loss per share	$ (0.46)	$ (0.64)
Diluted net loss per share	$ (0.46)	$ (0.64)