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Equity-based Compensation - Summary of Stock Option Activity for Employees and Non-employees (Detail) - Employees and Non-employees [Member] - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock Options, Outstanding, Beginning Balance 6,262,339  
Stock Options, Granted 1,735,997  
Stock Options, Exercised (747,007)  
Stock Options, Cancelled or forfeited (634,148)  
Stock Options, Outstanding, Ending Balance 6,617,181 6,262,339
Stock Options, Exercisable 1,757,151  
Stock Options, Vested or expected to vest 6,617,181  
Weighted-Average Exercise Price, Outstanding, Beginning Balance $ 13.24  
Weighted-Average Exercise Price, Granted 52.47  
Weighted-Average Exercise Price, Exercised 10.47  
Weighted-Average Exercise Price, Cancelled or forfeited 18.43  
Weighted-Average Exercise Price, Outstanding, Ending Balance 23.35 $ 13.24
Weighted-Average Exercise Price, Exercisable 12.38  
Weighted-Average Exercise Price, Vested or expected to vest $ 23.35  
Weighted-Average Remaining Contractual Term 8 years 9 months 18 days 8 years 9 months 18 days
Weighted-Average Remaining Contractual Term, Exercisable 8 years 1 month 6 days  
Weighted-Average Remaining Contractual Term, Vested or expected to vest 8 years 9 months 18 days  
Aggregate Intrinsic Value, Outstanding Balance $ 235,281 $ 64,120
Aggregate Intrinsic Value, Exercisable 81,507  
Aggregate Intrinsic Value, Vested or expected to vest $ 235,281