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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
6 Months Ended
Jun. 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 498,503
Number of Shares, Expected to Vest 495,757
Number of Shares, Exercisable 296,384
Weighted Average Exercise Price, Outstanding | $ / shares $ 9.43
Weighted Average Exercise Price, Expected to Vest | $ / shares 9.42
Weighted Average Exercisable, Exercise Price | $ / shares $ 8.03
Weighted Average Remaining Life, Outstanding 63 months
Weighted Average Remaining Contractual Life, Expected to Vest 62 months
Weighted Average Remaining Contractual Life, Exercisable 44 months
Intrinsic Value, Outstanding | $ $ 3,897
Intrinsic Value, Expected to Vest | $ 3,881
Intrinsic Value, Exercisable | $ $ 2,733