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Consolidated Balance Sheets (Parenthetical) - $ / shares
Mar. 31, 2019
Dec. 31, 2018
Class A Non-voting Common Stock    
Common stock par value $ 0.00001 $ 0.00001
Common stock authorized 3,000,000,000 3,000,000,000
Common stock issued 1,057,135,000 999,304,000
Common stock outstanding 1,057,135,000 999,304,000
Class B Voting Common Stock    
Common stock par value $ 0.00001 $ 0.00001
Common stock authorized 700,000,000 700,000,000
Common stock issued 51,510,000 93,846,000
Common stock outstanding 51,510,000 93,846,000
Class C Voting Common Stock    
Common stock par value $ 0.00001 $ 0.00001
Common stock authorized 260,888,000 260,888,000
Common stock issued 226,287,000 224,611,000
Common stock outstanding 226,287,000 224,611,000