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Summary of Restricted Stock Units Activity (Detail) - Restricted Stock Units (RSUs)
9 Months Ended
Sep. 30, 2016
$ / shares
shares
Number of RSUs  
Number of RSUs, Unvested, Beginning balance | shares 234,000
Number of RSUs granted | shares 372,617
Number of RSUs vested | shares (97,640)
Number of RSUs Forfeited or expired | shares (15,969)
Number of RSUs, Unvested, Ending balance | shares 493,008
Number of RSUs, Expected to vest | shares 452,937
Weighted Average Grant-Date Fair Value  
Weighted Average Grant-Date Fair Value, Beginning balance | $ / shares $ 19.89
Weighted Average Grant-Date Fair Value, RSUs granted | $ / shares 21.51
Weighted Average Grant-Date Fair value, RSUs vested | $ / shares 19.61
Weighted Average Grant-Date Fair Value, RSUs Forfeited or expired | $ / shares 20.12
Weighted Average Grant-Date Fair Value, Ending balance | $ / shares 21.16
Weighted Average Grant-Date Fair Value, Expected to vest | $ / shares $ 21.16