Quarterly report pursuant to Section 13 or 15(d)

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

v3.8.0.1
Redeemable Convertible Preferred Stock - Schedule of Redeemable Convertible Preferred Stock (Details) - Series A convertible preferred stock - USD ($)
$ in Thousands
3 Months Ended 4 Months Ended 12 Months Ended
Mar. 31, 2018
Sep. 22, 2017
Dec. 31, 2017
Temporary Equity [Line Items]      
Series A redeemable convertible preferred stock $ 480,000   $ 480,000
Issuance costs (29,318) $ (29,300) (29,318)
Accretion of issuance costs 29,318   29,318
Stock dividend payable to preferred stockholders 18,211   10,849
Redeemable convertible preferred stock $ 498,211   $ 490,849