Stockholders' Equity (Deficit) - Disclosure of Future Issuance (Detail) - shares shares in Thousands	Sep. 30, 2022	Dec. 31, 2021
Class of Stock [Line Items]
Common stock shares reserved for future issuance (in shares)	169,795	148,863
Stock options outstanding
Class of Stock [Line Items]
Common stock shares reserved for future issuance (in shares)	53,412	63,267
RSUs outstanding
Class of Stock [Line Items]
Common stock shares reserved for future issuance (in shares)	30,731	14,684
PSUs outstanding | CEO Long-Term Performance Award
Class of Stock [Line Items]
Common stock shares reserved for future issuance (in shares)	11,500	11,500
PSUs outstanding | 2022 PSU Grants
Class of Stock [Line Items]
Common stock shares reserved for future issuance (in shares)	415	0
Shares available for issuance under Equity Incentive Plan
Class of Stock [Line Items]
Common stock shares reserved for future issuance (in shares)	61,748	52,811
2020 ESPP
Class of Stock [Line Items]
Common stock shares reserved for future issuance (in shares)	11,093	5,809
Stock Warrants outstanding
Class of Stock [Line Items]
Common stock shares reserved for future issuance (in shares)	264	324
Unregistered restricted stock awards outstanding
Class of Stock [Line Items]
Common stock shares reserved for future issuance (in shares)	632	468