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Net Loss per Share - Numerators and Denominators of Basic and Diluted Net Loss per Share Computations for Common Stock (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Numerator:    
Net loss $ (310,407) $ (385,785)
Basic shares:    
Weighted-average common shares - Basic 1,340,615 1,270,998
Diluted shares:    
Weighted-average common shares - Diluted 1,340,615 1,270,998
Net loss per share attributable to common stockholders:    
Basic $ (0.23) $ (0.30)
Diluted $ (0.23) $ (0.30)
Class A Common Stock    
Numerator:    
Net loss $ (239,860) $ (276,790)
Net loss attributable to common stockholders $ (239,860) $ (276,790)
Basic shares:    
Weighted-average common shares - Basic 1,035,932 911,906
Diluted shares:    
Weighted-average common shares - Diluted 1,035,932 911,906
Net loss per share attributable to common stockholders:    
Basic $ (0.23) $ (0.30)
Diluted $ (0.23) $ (0.30)
Class B Common Stock    
Numerator:    
Net loss $ (13,601) $ (32,989)
Net loss attributable to common stockholders $ (13,601) $ (32,989)
Basic shares:    
Weighted-average common shares - Basic 58,741 108,683
Diluted shares:    
Weighted-average common shares - Diluted 58,741 108,683
Net loss per share attributable to common stockholders:    
Basic $ (0.23) $ (0.30)
Diluted $ (0.23) $ (0.30)
Class C Common Stock    
Numerator:    
Net loss $ (56,946) $ (76,006)
Net loss attributable to common stockholders $ (56,946) $ (76,006)
Basic shares:    
Weighted-average common shares - Basic 245,942 250,409
Diluted shares:    
Weighted-average common shares - Diluted 245,942 250,409
Net loss per share attributable to common stockholders:    
Basic $ (0.23) $ (0.30)
Diluted $ (0.23) $ (0.30)