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Weighted Average Exercise Prices for Options Granted and Exercisable and Weighted Average Remaining Contractual Life for Options Outstanding (Detail) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Shares, Expected to Vest 19,760 3,900
Incentive Stock Option Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Shares, Outstanding 394,358  
Number of Shares, Expected to Vest 394,358  
Number of Shares, Exercisable 394,358  
Weighted Average Exercise Price, Outstanding $ 9.12  
Weighted Average Exercise Price, Expected to Vest 9.12  
Weighted Average Exercisable, Exercise Price $ 9.12  
Weighted Average Remaining Life, Outstanding 48 months  
Weighted Average Remaining Contractual Life, Expected to Vest 48 months  
Weighted Average Remaining Contractual Life, Exercisable 48 months  
Intrinsic Value, Outstanding $ 5,452  
Intrinsic Value, Expected to Vest 5,452  
Intrinsic Value, Exercisable $ 5,452