Net Loss Per Share - Basic and Diluted Net Loss Per Share Attributable to Common Stockholders (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Numerator:
Net loss	$ (10,308)	$ (22,502)
Cumulative dividends on redeemable convertible preferred stock		(3,419)
Net loss attributable to common stockholders	$ (10,308)	$ (25,921)
Denominator:
Weighted average common shares outstanding, basic and diluted	20,333,398	3,001,660
Net loss per share attributable to common stockholders, basic and diluted	$ (0.51)	$ (8.64)