Net (Loss) Income per Share Attributable to Common Stock - Computation of Net 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 (loss) income	$ (18,949)	$ 34,166	$ (82,611)	$ (32,562)
Dividends on convertible preferred stock	(1,662)	(1,530)	(5,875)	(2,814)
Undistributed earnings attributable to participating securities, diluted	0	(653)	0	0
Undistributed earnings attributable to participating securities, basic	0	(653)	0	0
Net loss attributable to common stock - basic	(20,611)	31,983	(88,486)	(35,376)
Net loss attributable to common stock - diluted	$ (20,611)	$ 31,983	$ (88,486)	$ (35,376)
Denominator:
Weighted average shares - basic (in shares)	105,144,872	99,840,144	104,327,614	97,365,122
Dilutive shares from stock plans (in shares)	0	7,767,567	0	0
Weighted averages shares - diluted (in shares)	105,144,872	107,607,711	104,327,614	97,365,122
Earnings Per Share, Basic and Diluted [Abstract]
Net loss per share attributable to common stock - basic (in dollars per share)	$ (0.20)	$ 0.32	$ (0.85)	$ (0.36)
Net loss per share attributable to common stock - diluted (in dollars per share)	$ (0.20)	$ 0.30	$ (0.85)	$ (0.36)