Stockholders' Equity (Deficit) - Disclosure Of Future Issuance (Detail) - shares shares in Thousands	Mar. 31, 2022	Dec. 31, 2021
Class of Stock [Line Items]
Common stock shares reserved for future issuance (in shares)	177,661	148,863
Stock options outstanding
Class of Stock [Line Items]
Common stock shares reserved for future issuance (in shares)	58,685	63,267
RSUs outstanding
Class of Stock [Line Items]
Common stock shares reserved for future issuance (in shares)	14,489	14,684
PSUs outstanding
Class of Stock [Line Items]
Common stock shares reserved for future issuance (in shares)	11,500	11,500
Shares available for issuance under Equity Incentive Plan
Class of Stock [Line Items]
Common stock shares reserved for future issuance (in shares)	80,924	52,811
2020 ESPP
Class of Stock [Line Items]
Common stock shares reserved for future issuance (in shares)	11,333	5,809
Stock Warrants outstanding
Class of Stock [Line Items]
Common stock shares reserved for future issuance (in shares)	294	324
Unregistered restricted stock awards outstanding
Class of Stock [Line Items]
Common stock shares reserved for future issuance (in shares)	436	468