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Commitments and Contingencies - Series A Convertible Redeemable Preferred Stock Offering (Details) - USD ($)
 2 Months Ended 3 Months Ended 6 Months Ended
Apr. 23, 2018
Feb. 06, 2017
Jan. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Subsidiary, Sale of Stock [Line Items]                
Proceeds from issuance of convertible redeemable preferred stock, net of issuance costs           $ 0 $ 55,290,000  
Accretion of redeemable noncontrolling interests and equity           61,974,000    
Payment of dividends on Series A Preferred Stock           11,103,000 0  
Gain upon conversion of Series A convertible redeemable preferred stock       $ 74,110,000 $ 0 74,110,000 0  
Series A Convertible Redeemable Preferred Stock                
Subsidiary, Sale of Stock [Line Items]                
Accretion of redeemable noncontrolling interests and equity       4,650,000 61,934,000 61,974,000 101,194,000  
Total redeemable noncontrolling interests and equity       0   0   $ 400,276,000
Gain upon conversion of Series A convertible redeemable preferred stock       $ 74,110,000 $ 0      
Series A Convertible Redeemable Preferred Stock | Additional paid-in capital                
Subsidiary, Sale of Stock [Line Items]                
Accretion of redeemable noncontrolling interests and equity           61,974,000    
Series A Redeemable Convertible Preferred Stock - Beneficial Conversion Feature                
Subsidiary, Sale of Stock [Line Items]                
Accretion of redeemable noncontrolling interests and equity           $ (265,368,000)    
Series A Redeemable Convertible Preferred Stock - Beneficial Conversion Feature | Additional paid-in capital                
Subsidiary, Sale of Stock [Line Items]                
Accretion period           1 year    
Series A Preferred Stock                
Subsidiary, Sale of Stock [Line Items]                
Payment of dividends on Series A Preferred Stock           $ 11,103,000 $ 0  
Class A Common Stock                
Subsidiary, Sale of Stock [Line Items]                
Common stock, par value (in dollars per share)   $ 0.004   $ 0.004   $ 0.004   $ 0.004
Private Placement | Series A Convertible Redeemable Preferred Stock                
Subsidiary, Sale of Stock [Line Items]                
Sale of stock, number of shares agreed to be issued in transaction (in shares)     400,000          
Proceeds from issuance of convertible redeemable preferred stock, net of issuance costs     $ 400,000,000          
Period for conversion of stock after first anniversary of initial public offering   1 day            
Number of shares converted (in shares) 36,143,000