Net Loss Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Numerator:
Net loss	$ (29,647)	$ (24,250)
Denominator:
Weighted-average shares outstanding - basic and diluted	144,692	136,911
Net loss per common share - basic and diluted:	$ (0.20)	$ (0.18)