Net Loss per Common Share - Summary of Basic and Diluted Net Loss Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerator:
Net loss	$ (14,175)	$ (8,003)	$ (36,968)	$ (3,191)	$ (3,100)	$ (1,958)	$ (59,146)	$ (8,249)
Denominator:
Weighted-average common shares outstanding, basic and diluted	1,581,610			1,088,222			1,468,777	979,081
Net loss per common share, basic and diluted	$ (8.96)			$ (2.93)			$ (40.27)	$ (8.43)