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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 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Numerator:        
Net loss $ (71,959) $ (199,853) $ (510,505) $ (831,740)
Basic shares:        
Weighted-average common shares - Basic 1,580,966 1,466,420 1,543,568 1,446,040
Diluted shares:        
Weighted-average common shares - Diluted 1,580,966 1,466,420 1,543,568 1,446,040
Net loss per share attributable to common stockholders:        
Basic $ (0.05) $ (0.14) $ (0.33) $ (0.58)
Diluted $ (0.05) $ (0.14) $ (0.33) $ (0.58)
Class A Common Stock        
Numerator:        
Net loss $ (60,340) $ (164,499) $ (426,077) $ (680,951)
Net loss attributable to common stockholders $ (60,340) $ (164,499) $ (426,077) $ (680,951)
Basic shares:        
Weighted-average common shares - Basic 1,325,700 1,207,015 1,288,290 1,183,882
Diluted shares:        
Weighted-average common shares - Diluted 1,325,700 1,207,015 1,288,290 1,183,882
Net loss per share attributable to common stockholders:        
Basic $ (0.05) $ (0.14) $ (0.33) $ (0.58)
Diluted $ (0.05) $ (0.14) $ (0.33) $ (0.58)
Class B Common Stock        
Numerator:        
Net loss $ (1,076) $ (3,234) $ (7,822) $ (13,867)
Net loss attributable to common stockholders $ (1,076) $ (3,234) $ (7,822) $ (13,867)
Basic shares:        
Weighted-average common shares - Basic 23,639 23,732 23,651 24,109
Diluted shares:        
Weighted-average common shares - Diluted 23,639 23,732 23,651 24,109
Net loss per share attributable to common stockholders:        
Basic $ (0.05) $ (0.14) $ (0.33) $ (0.58)
Diluted $ (0.05) $ (0.14) $ (0.33) $ (0.58)
Class C Common Stock        
Numerator:        
Net loss $ (10,543) $ (32,120) $ (76,606) $ (136,922)
Net loss attributable to common stockholders $ (10,543) $ (32,120) $ (76,606) $ (136,922)
Basic shares:        
Weighted-average common shares - Basic 231,627 235,674 231,627 238,049
Diluted shares:        
Weighted-average common shares - Diluted 231,627 235,674 231,627 238,049
Net loss per share attributable to common stockholders:        
Basic $ (0.05) $ (0.14) $ (0.33) $ (0.58)
Diluted $ (0.05) $ (0.14) $ (0.33) $ (0.58)