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Weighted Average Exercise Prices for Options Granted and Exercisable and Weighted Average Remaining Contractual Life for Options Outstanding (Detail)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2017
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Expected to Vest 3,900
Incentive Stock Option Plan  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Number of Shares, Outstanding 482,218
Number of Shares, Expected to Vest 480,800
Number of Shares, Exercisable 284,384
Weighted Average Exercise Price, Outstanding | $ / shares $ 9.46
Weighted Average Exercise Price, Expected to Vest | $ / shares 9.46
Weighted Average Exercisable, Exercise Price | $ / shares $ 8.05
Weighted Average Remaining Life, Outstanding 60 months
Weighted Average Remaining Contractual Life, Expected to Vest 60 months
Weighted Average Remaining Contractual Life, Exercisable 41 months
Intrinsic Value, Outstanding | $ $ 6,480
Intrinsic Value, Expected to Vest | $ 6,464
Intrinsic Value, Exercisable | $ $ 4,222