Common Stock and Warrants - Schedule of Common Stock Reserved for Issuance (Detail) - shares	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Jun. 10, 2021
Class Of Stock [Line Items]
Redeemable convertible preferred stock		209,181,855
Outstanding stock options	73,609,565	67,377,463
Total shares of common stock reserved	144,601,515	278,819,076
2006 Equity Incentive Plan
Class Of Stock [Line Items]
Shares available for future issuance under equity incentive plan		2,259,758
2021 Equity Incentive Plan
Class Of Stock [Line Items]
Shares available for future issuance under equity incentive plan	48,895,572
Employee Stock Purchase Plan
Class Of Stock [Line Items]
Shares available for future issuance under equity incentive plan	11,420,000	0
Total shares of common stock reserved			11,420,000
Restricted Stock Units [Member]
Class Of Stock [Line Items]
Outstanding restricted stock units	10,676,378