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Net Income (Loss) Per Share - Computation of Basic and Diluted Net Income per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Numerator:
Net income (loss)	$ (800)	$ 3,452
Denominator:
Shares used in per share calculation - basic (in shares)	26,620	24,719
Dilutive effect of common stock (in shares)	0	1,460
Total common stock shares used in diluted share calculation (in shares)	26,620	26,179
Net income (loss) per share - basic (in usd per share)	$ (0.03)	$ 0.14
Net income (loss) per share - diluted (in usd per share)	$ (0.03)	$ 0.13

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