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Stockholders' Equity - Summary of Outstanding RSUs (Detail)
9 Months Ended
Sep. 30, 2018
$ / shares
shares
Restricted stock units | Performance-based RSUs  
Shares  
Beginning Balance (shares) 393,084
Granted (shares) 334,035
Vested (shares) (29,257)
Forfeited (shares) (23,849)
Ending Balance (shares) 674,013
Weighted- Average Grant Date Fair Value  
Beginning Balance, Weighted Average Grant Date Fair Value (usd per share) | $ / shares $ 18.54
Granted, Weighted Average Grant Date Fair Value (usd per share) | $ / shares 15.65
Vested, Weighted Average Grant Date Fair Value (usd per share) | $ / shares 16.21
Forfeited, Weighted Average Grant Date Fair Value (usd per share) | $ / shares 17.37
Ending Balance, Weighted Average Grant Date Fair Value (usd per share) | $ / shares $ 17.25
Restricted Stock and Restricted Stock Units (RSUs) | 2011 Long Term Incentive Plan  
Weighted- Average Grant Date Fair Value  
Shares not expected to vest (shares) 99,133