Redeemable Convertible Preferred Stock Warrants - Summary Of Outstanding Redeemable Convertible Preferred Stock Warrants (Details) - Series D Redeemable Convertible Preferred Stock Warrants - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Class Of Stock [Line Items]
Exercise price per share	$ 11.31	$ 11.31
Shares	77,842	77,842
Fair value of liability	$ 577	$ 42
Expiration date	2029-06	2029-06