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SAFE Notes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Aug. 12, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Class of Stock [Line Items]            
Proceeds from issuance of SAFE notes       $ 30,853 $ 44,650  
SAFE notes, principal amount $ 78,000          
Fair value of SAFE notes $ 136,000 $ 136,001        
Estimated fair value of SAFE notes   0   0   $ 314,400
Income (loss) from decrease (increase) in estimated fair value of SAFE notes   $ 26,924 $ (99,107) $ 209,291 $ (102,695)  
Common Class A            
Class of Stock [Line Items]            
Liability conversion (in shares) 12,403,469