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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
	Mar. 31, 2020	Mar. 31, 2019
Numerator:
Net income (loss)	$ (1,202)	$ 337
Weighted average shares used in calculating income (loss) per share:
Basic	9,690	9,626
Plus dilutive effect of potential common shares		335
Weighted average common shares outstanding - diluted	9,690	9,961
Net income (loss) per share:
Basic	$ (0.12)	$ 0.03
Diluted	$ (0.12)	$ 0.03

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