Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Summary of Stock Option Activity (Detail)

v3.10.0.1
Stockholders' Equity - Summary of Stock Option Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Exercised, Shares (622,982) 0
2014 EIP and 2018 IP    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Outstanding, Shares, beginning balance 5,229,648  
Granted, Shares 1,578,750  
Exercised, Shares (622,982)  
Forfeited or expired, Shares (466,502)  
Outstanding, Shares, ending balance 5,718,914  
Vested and expected to vest, Shares 5,718,914  
Exercisable, Shares 2,037,856  
Outstanding, Weighted Average Exercise Price, beginning balance $ 21.06  
Granted, Weighted Average Exercise Price 38.48  
Exercised, Weighted Average Exercise Price 22.37  
Forfeited or expired, Weighted Average Exercise price 35.32  
Outstanding, Weighted Average Exercise Price, ending balance 24.56  
Stock options vested and expected to vest, Weighted Average Exercise Price 24.56  
Exercisable, Weighted Average Exercise Price $ 21.89  
Outstanding, Weighted Average Remaining Contractual Term 5 years 4 months 24 days  
Stock options vested and expected to vest, Weighted Average Remaining Contractual Term 5 years 4 months 24 days  
Exercisable, Weighted Average Remaining Contractual Term 4 years 3 months 18 days  
Aggregate intrinsic value $ 74,744  
Vested and expected to vest, Aggregate Intrinsic Value 74,744  
Exercisable, Aggregate Intrinsic Value $ 30,678