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Net Loss Per Share - Summary of Computation of Net Loss Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Numerator:        
Net loss $ (2,609) $ (736) $ (2,372) $ (1,938)
Denominator:        
Basic weighted average common shares outstanding 10,026 9,683 9,948 9,686
Plus dilutive effect of potential common shares 0 0 0 0
Diluted weighted average common shares outstanding 10,026 9,683 9,948 9,686
Net loss per share:        
Basic $ (0.26) $ (0.08) $ (0.24) $ (0.20)
Diluted $ (0.26) $ (0.08) $ (0.24) $ (0.20)