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Stock-Based Compensation - Summary of Restricted Stock Units (Detail) - Restricted Stock Units (RSUs) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Nonvested Restricted Stock Units, Beginning Balance (shares) 3,341,848  
Nonvested Restricted Stock Units, Granted (shares) 1,593,747  
Nonvested Restricted Stock Units, Vested (shares) (795,528)  
Nonvested Restricted Stock Units, Forfeited (shares) (745,756)  
Nonvested Restricted Stock Units, Ending Balance (shares) 3,394,311  
Weighted Average Grant Date Fair Value, Beginning Balance (in dollars per share) $ 11.05  
Weighted Average Grant Date Fair Value, Granted (in dollars per share) 12.10  
Weighted Average Grant Date Fair Value, Vested (in dollars per share) 12.70  
Weighted Average Grant Date Fair Value, Forfeited (in dollars per share) 5.20  
Weighted Average Grant Date Fair Value, Ending Balance (in dollars per share) $ 12.45  
Aggregate Intrinsic Value, Balance $ 42,904 $ 36,526
Aggregate Intrinsic Value, Granted $ 0