Net Loss Per Share - Computation of Basic and Diluted Net Loss Per Share Attributable to Common Stockholders (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Net loss	$ (11,596)	$ (41,248)
Accretion of redeemable series A-1 preferred stock		(5,415)
Convertible and redeemable series A-2 preferred stock dividend	(4,100)
Net loss attributable to common stockholders – basic and diluted	$ (15,696)	$ (46,663)
Weighted-average common shares outstanding – basic and diluted	25,117	8,904
NET LOSS PER SHARE ATTRIBUTABLE TO COMMON STOCKHOLDERS— BASIC AND DILUTED	$ (0.62)	$ (5.24)