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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Dec. 31, 2018
Dec. 31, 2017
Class A common stock    
Common stock, par or stated value per share $ 0.0001 $ 0.0001
Common stock, shares authorized 1,000,000,000 1,000,000,000
Common stock, shares issued 69,445,000 65,855,000
Common stock, shares outstanding 69,445,000 65,855,000
Class B common stock    
Common stock, par or stated value per share $ 0.0001 $ 0.0001
Common stock, shares authorized 250,000,000 250,000,000
Common stock, shares issued 11,601,000 12,199,000
Common stock, shares outstanding 11,601,000 12,199,000