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Summary of Restricted Stock Units Activity (Detail) - Restricted Stock Units (RSUs)
12 Months Ended
Dec. 31, 2016
$ / shares
shares
Number of RSUs  
Number of RSUs, Unvested, Beginning balance | shares 234,000
Number of RSUs granted | shares 394,417
Number of RSUs vested | shares (99,972)
Number of RSUs forfeited | shares (23,303)
Number of RSUs, Unvested, Ending balance | shares 505,142
Number of RSUs, Expected to vest | shares 463,757
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 22.05
Weighted average Grant-Date fair value, RSUs vested | $ / shares 19.73
Weighted average Grant-Date fair value, RSUs forfeited | $ / shares 20.16
Weighted average Grant-Date fair value, Ending balance | $ / shares 21.59
Weighted average Grant-Date fair value, Expected to vest | $ / shares $ 21.58