Net Loss Per Share - Computation of Basic and Diluted Net Loss (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share [Abstract]
Net loss	$ (46,677)	$ (42,731)	$ (99,013)
Weighted-average shares used to compute net loss per share, basic (in shares)	106,387	101,009	96,014
Weighted-average shares used to compute net loss per share, diluted (in shares)	106,387	101,009	96,014
Net loss per share, basic (in usd per share)	$ (0.44)	$ (0.42)	$ (1.03)
Net loss per share, diluted (in usd per share)	$ (0.44)	$ (0.42)	$ (1.03)