Common Stock and Warrants - Schedule of Common Stock Reserved for Issuance (Detail) - shares	3 Months Ended
	Jun. 30, 2021	Mar. 31, 2021
Class Of Stock [Line Items]
Redeemable convertible preferred stock	0	209,181,855
Outstanding stock options	65,962,668	67,377,405
Total shares of common stock reserved	161,048,582	278,819,018
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	67,182,537	0
Private Warrants
Class Of Stock [Line Items]
Class of warrant or right outstanding reserved for future issuance	8,113,999	0
Public Warrants
Class Of Stock [Line Items]
Class of warrant or right outstanding reserved for future issuance	16,951,609	0
Restricted Stock Units [Member]
Class Of Stock [Line Items]
Outstanding restricted stock units	2,837,769	0