Net Loss Per Share Attributable to Common Stockholders - Reconciliation of Numerator and Denominator Used in Calculation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ 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
Net loss per share:
Net loss	$ (22,831)	$ (22,856)	$ (17,001)	$ 11,029	$ (45,687)	$ (5,972)
Net loss attributable to common stockholders	$ (22,831)		$ (17,001)		$ (45,687)	$ (5,972)
Weighted-average common shares outstanding used to calculate net loss per share attributable to common stockholders:
Basic (in shares)	35,746,922		12,253,943		35,726,393	7,062,780
Diluted (in shares)	35,746,922		12,253,943		35,726,393	7,062,780
Net loss per share, attributable to common stockholders:
Basic (USD per share)	$ (0.64)		$ (1.39)		$ (1.28)	$ (0.85)
Diluted (USD per share)	$ (0.64)		$ (1.39)		$ (1.28)	$ (0.85)