Net Income (Loss) Per Share - Components of Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerator:
Net income (loss)	$ 1,948	$ (12,932)	$ (22,078)	$ (49,825)
Basic:
Basic	35,207,276	34,078,726	35,013,072	32,631,715
Shares used in computing net income (loss) per share
Basic	35,207,276	34,078,726	35,013,072	32,631,715
Dilutive effect of outstanding common stock options	1,645,968
Dilutive effect of restricted stock units	708,788
Dilutive effect of common stock pursuant to employee stock purchase plan	5,144
Weighted average number of common shares outstanding - diluted	37,567,176	34,078,726	35,013,072	32,631,715
Net income (loss) per share:
Basic	$ 0.06	$ (0.38)	$ (0.63)	$ (1.53)
Diluted	$ 0.05	$ (0.38)	$ (0.63)	$ (1.53)