Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended				3 Months Ended			8 Months Ended	9 Months Ended		13 Months Ended
	Jan. 31, 2021	Jun. 30, 2020	Feb. 29, 2020	Feb. 28, 2019	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jan. 31, 2021	Sep. 30, 2021	Sep. 30, 2020	Feb. 29, 2020
Class Of Stock [Line Items]
Gross proceeds from stock issued									$ 45,375	$ 82,267
Series A-2
Class Of Stock [Line Items]
Redeemable convertible preferred stock, issued and sold			44,375,000	88,750,000			44,375,000
Redeemable convertible preferred stock, price per share											$ 0.40
Gross proceeds from stock issued											$ 35,600
Series B
Class Of Stock [Line Items]
Redeemable convertible preferred stock, issued and sold	87,259,605	124,519,220			87,259,605	124,519,220
Redeemable convertible preferred stock, price per share								$ 0.52
Gross proceeds from stock issued								$ 110,100