Net (Loss) Income Per Share - Computation of Basic and Diluted Net (Loss) Income Per Share Attributable to Common Stockholders (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Net (loss) income	$ (14,483)	$ (11,596)	$ 13,224	$ (41,248)	$ (26,079)	$ (28,024)
Accretion of redeemable series A-1 preferred stock			(5,644)			(11,059)
Convertible and redeemable series A-2 preferred stock dividend	(4,100)				(8,200)
Net (loss) income attributable to common stockholders –basic and diluted	$ (18,583)		$ 7,580		$ (34,279)	$ (39,083)
Weighted-average common shares outstanding – basic	26,056		10,649		25,586	9,718
Net (loss) income per share attributable to common stockholders –basic	$ (0.71)		$ 0.71		$ (1.34)	$ (4.02)
Weighted-average common shares outstanding – diluted	26,056		19,139		25,586	9,718
Net (loss) income per share attributable to common stockholders –diluted	$ (0.71)		$ 0.40		$ (1.34)	$ (4.02)