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Stockholders' Equity - Common Stock, Convertible Preferred Stock, Preferred Stock (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 26, 2018
shares
Dec. 31, 2017
shares
Mar. 31, 2019
vote
$ / shares
shares
Dec. 31, 2018
shares
Class of Stock [Line Items]        
Preferred stock, shares authorized (in shares)     240,000,000  
Restricted Stock        
Class of Stock [Line Items]        
Shares granted (in shares)     2,300,000  
Co-Founder Grants | Restricted Stock        
Class of Stock [Line Items]        
Shares granted (in shares)   14,700,000 14,700,000 14,700,000
Class A common stock        
Class of Stock [Line Items]        
Votes per share | vote     1  
Common stock, shares authorized (in shares)     2,400,000,000  
Common stock, par value (in dollars per share) | $ / shares     $ 0.00001  
Common stock, shares issued (in shares)     224,100,000 211,000,000
Common stock, shares outstanding (in shares)     224,100,000 211,000,000
Shares issued in conversion (in shares)     11,800,000  
Class A common stock | Conversion of Convertible Preferred Stock to Class A Common Stock        
Class of Stock [Line Items]        
Shares issued in conversion (in shares) 258,620      
Class B common stock        
Class of Stock [Line Items]        
Votes per share | vote     10  
Shares converted in conversion (in shares)     11,800,000  
Common stock, shares authorized (in shares)     475,000,000  
Common stock, par value (in dollars per share) | $ / shares     $ 0.00001  
Common stock, shares issued (in shares)     187,300,000 198,600,000
Common stock, shares outstanding (in shares)     187,300,000 198,600,000
Class B common stock | Conversion of Convertible Preferred Stock to Class B Common Stock        
Class of Stock [Line Items]        
Shares issued in conversion (in shares) 147,310,563      
Class C common stock        
Class of Stock [Line Items]        
Votes per share | vote     0  
Common stock, shares authorized (in shares)     800,000,000  
Common stock, par value (in dollars per share) | $ / shares     $ 0.00001  
Common stock, shares issued (in shares)     0 0
Common stock, shares outstanding (in shares)     0 0
Convertible preferred stock | Conversion of Convertible Preferred Stock to Class B Common Stock        
Class of Stock [Line Items]        
Shares converted in conversion (in shares) 147,310,563      
Convertible preferred stock | Conversion of Convertible Preferred Stock to Class A Common Stock        
Class of Stock [Line Items]        
Shares converted in conversion (in shares) 258,620