Common Stock and Warrants - Schedule of Common Stock Reserved for Issuance (Detail) - shares	9 Months Ended	12 Months Ended
	Dec. 31, 2021	Mar. 31, 2021
Class Of Stock [Line Items]
Redeemable convertible preferred stock	0	209,181,855
Outstanding stock options	66,252,927	67,377,463
Shares available for future issuance under equity incentive plan	136,314,305	278,819,076
2006 Equity Incentive Plan
Class Of Stock [Line Items]
Shares available for future issuance under equity incentive plan	0	2,259,758
2021 Equity Incentive Plan
Class Of Stock [Line Items]
Shares available for future issuance under equity incentive plan	60,360,295	0
Restricted Stock Units [Member]
Class Of Stock [Line Items]
Outstanding restricted stock units	9,701,083	0