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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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Numerator:        
Net income (loss) $ (736) $ 662 $ (1,938) $ 998
Denominator:        
Weighted average common shares outstanding - basic 9,683 9,697 9,686 9,661
Plus dilutive effect of potential common shares   431   410
Weighted average common shares outstanding - diluted 9,683 10,128 9,686 10,071
Net income (loss) per share:        
Basic $ (0.08) $ 0.07 $ (0.20) $ 0.10
Diluted $ (0.08) $ 0.07 $ (0.20) $ 0.10