Net Income (loss) per Share - Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net income (loss)	$ 2,244	$ (6,094)	$ (11,089)	$ (20,090)
Denominator:
Weighted average common stock shares used in computing net income (loss) per share, basic (in shares)	64,628	59,061	64,452	58,984
Effect of dilutive shares (shares)	3,113	0	0	0
Weighted average common stock shares used in computing net income (loss) per share, diluted (in shares)	67,741	59,061	64,452	58,984
Net income (loss) per share, basic (in usd per share)	$ 0.03	$ (0.10)	$ (0.17)	$ (0.34)
Net income (loss) per share, diluted (in usd per share)	$ 0.03	$ (0.10)	$ (0.17)	$ (0.34)