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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - $ / shares
Sep. 30, 2021
Dec. 31, 2020
Class of Stock [Line Items]    
Preferred stock, par value (in USD per share) $ 0.0000001 $ 0.0000001
Preferred stock, authorized (in shares) 100,000,000 100,000,000
Preferred stock, issued (in shares) 0 0
Preferred stock, outstanding (in shares) 0 0
Class A    
Class of Stock [Line Items]    
Common stock, par value (in USD per share) $ 0.0000001 $ 0.0000001
Common stock, authorized (in shares) 1,000,000,000 1,000,000,000
Common stock, issued (in shares) 398,878,883 390,187,079
Common stock, outstanding (in shares) 398,878,883 390,187,079
Class B    
Class of Stock [Line Items]    
Common stock, par value (in USD per share) $ 0.0000001 $ 0.0000001
Common stock, authorized (in shares) 500,000,000 500,000,000
Common stock, issued (in shares) 62,100,770 65,997,697
Common stock, outstanding (in shares) 62,100,770 65,997,697