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Stockholders' Equity (Deficit) - Disclosure Of Future Issuance (Detail) - shares
shares in Thousands
Jun. 30, 2021
Dec. 31, 2020
Class of Stock [Line Items]    
Common stock shares reserved for future issuance (in shares) 159,548 454,958
Convertible Preferred Stock    
Class of Stock [Line Items]    
Common stock shares reserved for future issuance (in shares) 0 337,235
Stock options outstanding    
Class of Stock [Line Items]    
Common stock shares reserved for future issuance (in shares) 73,244 98,502
Restricted Stock Units    
Class of Stock [Line Items]    
Common stock shares reserved for future issuance (in shares) 10,092 3,061
PSUs outstanding    
Class of Stock [Line Items]    
Common stock shares reserved for future issuance (in shares) 11,500 0
Shares available for issuance under Equity Incentive Plan    
Class of Stock [Line Items]    
Common stock shares reserved for future issuance (in shares) 58,032 15,448
2020 ESPP    
Class of Stock [Line Items]    
Common stock shares reserved for future issuance (in shares) 6,000 0
Stock Warrants outstanding    
Class of Stock [Line Items]    
Common stock shares reserved for future issuance (in shares) 324 324
Unregistered restricted stock awards outstanding    
Class of Stock [Line Items]    
Common stock shares reserved for future issuance (in shares) 356 388