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Unaudited Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Class A Common Stock      
Commons stock, par value (USD per share) $ 0.0003 $ 0.0003 $ 0.0003
Common stock, authorized (in shares) 400,000,000 400,000,000 400,000,000
Common stock, shares issued (in shares) 188,645,131 188,603,686 188,533,987
Common stock, shares outstanding (in shares) 188,645,131 188,603,686 188,533,987
Class B Convertible Common Stock      
Commons stock, par value (USD per share) $ 0.0003 $ 0.0003 $ 0.0003
Common stock, authorized (in shares) 34,450,000 34,450,000 34,450,000
Common stock, shares issued (in shares) 34,450,000 34,450,000 34,450,000
Common stock, shares outstanding (in shares) 34,450,000 34,450,000 34,450,000
Class C Common Stock      
Commons stock, par value (USD per share) $ 0.0003 $ 0.0003 $ 0.0003
Common stock, authorized (in shares) 400,000,000 400,000,000 400,000,000
Common stock, shares issued (in shares) 252,992,053 231,953,667 231,684,883
Common stock, shares outstanding (in shares) 252,992,053 231,953,667 231,684,883