Quarterly report pursuant to Section 13 or 15(d)

Redeemable Convertible Preferred Stock - Schedule of Redeemable Convertible Preferred Stock (Details)

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Redeemable Convertible Preferred Stock - Schedule of Redeemable Convertible Preferred Stock (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Temporary Equity [Line Items]          
Accretion of issuance costs       $ 13,935,000 $ 0
Stock dividend payable to preferred stockholders   $ 14,528,000 $ 0 14,528,000 $ 0
Series A convertible preferred stock          
Temporary Equity [Line Items]          
Initial closing of redeemable convertible preferred stock $ 172,500,000        
Series A redeemable convertible preferred stock 480,000,000.0 480,000,000.0   480,000,000.0  
Issuance costs   (13,900,000)   (13,935,000)  
Accretion of issuance costs       13,935,000  
Stock dividend payable to preferred stockholders       595,000  
Redeemable convertible preferred stock $ 173,095,000 $ 173,095,000   $ 173,095,000