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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
Mar. 28, 2020
Mar. 30, 2019
Numerator:    
Net loss $ (1,651) $ (3,048)
Denominator:    
Weighted average shares of common stock (basic) 13,786 13,630
Weighted average shares of common stock (diluted) 13,786 13,630
Per share data:    
Basic net loss per share $ (0.12) $ (0.22)
Diluted net loss per share $ (0.12) $ (0.22)