Net Loss per Share - Reconciliation of Numerator and Denominator Used in Calculation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net loss attributable to common stockholders	$ (6,155)	$ (4,763)	$ (15,699)	$ (12,946)
Weighted average number of shares of common stock	9,439	7,465	9,308	3,202
Basic and diluted net loss per share	$ (0.65)	$ (0.64)	$ (1.69)	$ (4.04)