Net Loss Per Share Attributable To Common Stockholders - Computation of EPS (Details) - USD ($) $ / shares in Units, $ 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, basic	$ (18,385)	$ (8,229)	$ (51,430)	$ (19,839)
Net loss attributable to common stockholders, diluted	$ (18,385)	$ (8,229)	$ (51,430)	$ (19,839)
Denominator:
Weighted-average common shares used in computing net loss per share attributable to common stockholders, basic (in shares)	61,133,518	10,285,401	60,625,601	9,709,501
Weighted-average common shares used in computing net loss per share attributable to common stockholders, diluted (in shares)	61,133,518	10,285,401	60,625,601	9,709,501
Net loss per share available to common shareholders, basic (in usd per share)	$ (0.30)	$ (0.80)	$ (0.85)	$ (2.04)
Net loss per share available to common shareholders, diluted (in usd per share)	$ (0.30)	$ (0.80)	$ (0.85)	$ (2.04)