Net Loss Per Share - Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Net loss	$ (22,977)	$ (21,440)
Weighted-average shares used to compute net loss per share (in shares)	98,855	93,738
Net loss per share, basic and diluted (in usd per share)	$ (0.23)	$ (0.23)