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Stock-Based Compensation - Summary of Restricted Stock Units (Detail) - Restricted Stock Units (RSUs) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Restricted Stock Units    
Nonvested RSUs at beginning of period (shares) 3,341,848  
Granted (shares) 1,656,333  
Vested (shares) (844,734)  
Forfeited (shares) (769,096)  
Nonvested RSUs at end of period (shares) 3,384,351  
Weighted Average Grant Date Fair Value Per Share    
Weighted Average Grant Date Fair Value, Beginning Balance (in usd per share) $ 11.05  
Weighted Average Grant Date Fair Value, Granted (in usd per share) 12.15  
Weighted Average Grant Date Fair Value, Vested (in usd per share) 12.95  
Weighted Average Grant Date Fair Value, Forfeited (in usd per share) 5.45  
Weighted Average Grant Date Fair Value, Ending Balance (in usd per share) $ 12.39  
Aggregate Intrinsic Value    
Aggregate Intrinsic Value, Granted  
Aggregate Intrinsic Value $ 52,694 $ 36,526