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Redeemable Convertible Preferred Stock (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2021
Jan. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Temporary Equity [Line Items]                    
Conversion of stock, shares converted (in shares) 153,937,730                  
Number of shares issued in conversion (in shares) 100.00%   100.00%   100.00%          
Carrying value $ 5,600,000,000   $ 5,541,758,000   $ 5,541,758,000          
Redeemable convertible preferred stock, issued (in shares) 0   0   0     153,937,730    
Redeemable convertible preferred stock, outstanding (in shares) 0   0 153,938,000 0 153,938,000 153,938,000 153,937,730 153,938,000 153,938,000
Redeemable convertible preferred stock, authorized (in shares) 0   0   0     154,055,430    
Aggregation liquidation preference $ 0   $ 0   $ 0     $ 326,559,000    
Stock-based compensation expense       $ 0 124,259,000 $ 43,280,000        
Accretion of redeemable convertible preferred stock     $ 2,264,838,000 $ 269,358,000 $ 2,646,662,000 371,522,000        
Secondary transaction                    
Temporary Equity [Line Items]                    
Amount paid by investor to acquire shares   $ 25,500,000                
Fair value of shares   14,700,000                
Stock-based compensation expense           $ 43,200,000        
Secondary transaction | General and administrative                    
Temporary Equity [Line Items]                    
Stock-based compensation expense   $ 10,800,000                
Redeemable Convertible Series A Preferred Stock | Secondary transaction                    
Temporary Equity [Line Items]                    
Number of shares issued and sold (in shares)   26,210,000                
Redeemable Convertible Series B Preferred Stock | Secondary transaction                    
Temporary Equity [Line Items]                    
Number of shares issued and sold (in shares)   1,314,830,000                
Redeemable Convertible Series C Preferred Stock | Secondary transaction                    
Temporary Equity [Line Items]                    
Number of shares issued and sold (in shares)   448,110,000