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Business Overview and Basis of Presentation (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
May 31, 2021
vote
shares
Jun. 30, 2021
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
shares
Jun. 30, 2021
USD ($)
$ / shares
Mar. 31, 2021
USD ($)
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Sep. 30, 2021
USD ($)
shares
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
shares
Initial Public Offering                      
Proceeds from initial public offering, net of underwriters’ discounts and commissions                 $ 1,319,809 $ 0  
Payments of stock issuance costs                 $ 3,134 1,231  
Preferred Stock, shares authorized (in shares) | shares     100,000,000           100,000,000   0
Business Risks and Uncertainties                      
Net loss     $ 45,730 $ 68,554 $ 12,838 $ 12,298 $ 7,107 $ 14,530 $ 127,122 33,935  
Accumulated deficit     380,646           380,646   $ 253,524
Cash and cash equivalents     1,260,220     $ 214,960     1,260,220 $ 214,960 $ 220,433
Marketable securities     $ 409,000           $ 409,000    
Class A Common Stock                      
Initial Public Offering                      
Common stock, shares authorized (in shares) | shares 1,500,000,000   1,500,000,000           1,500,000,000   0
Number of vote (votes per share) | vote 1                    
Class B Common Stock                      
Initial Public Offering                      
Common stock, shares authorized (in shares) | shares 600,000,000   600,000,000           600,000,000   545,000,000
Number of vote (votes per share) | vote 10                    
Convertible preferred stock, shares, number of shares issued upon conversion (in shares) | shares 203,610   351,844,340           351,844,340    
Preferred stock, convertible, conversion raio     1           1    
Number of common stock warrants converted to Class B common stock warrants (in warrants) | shares 2,569,528                    
Preferred Stock                      
Initial Public Offering                      
Preferred Stock, shares authorized (in shares) | shares 100,000,000                    
IPO | Class A Common Stock                      
Initial Public Offering                      
Sale of stock, number of shares issued in transaction (in shares) | shares   52,272,727                  
Share price (in dollars per share) | $ / shares   $ 27.00   $ 27.00              
Proceeds from initial public offering, net of underwriters’ discounts and commissions   $ 1,300,000                  
Payments for commissions and discounts   91,600                  
Payments of stock issuance costs   $ 7,500                  
Over-Allotment Option | Class A Common Stock                      
Initial Public Offering                      
Sale of stock, number of shares issued in transaction (in shares) | shares   6,818,181