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Net Income (Loss) Per Share - Summary of Computation of Net Income (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Numerator:        
Net income (loss) $ (261) $ (135) $ (2,199) $ 863
Denominator:        
Weighted average common shares outstanding - basic 9,710 9,711 9,694 9,678
Plus dilutive effect of potential common shares       405
Weighted average common shares outstanding - diluted 9,710 9,711 9,694 10,083
Net income (loss) per share:        
Basic $ (0.03) $ (0.01) $ (0.23) $ 0.09
Diluted $ (0.03) $ (0.01) $ (0.23) $ 0.09