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Weighted Average Exercise Prices for Options Granted and Exercisable and Weighted Average Remaining Contractual Life for Options Outstanding (Detail) - Incentive Stock Option Plan - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Shares, Outstanding 384,064 472,783
Number of Shares, Vested 384,064 472,783
Number of Shares, Exercisable 384,064 472,783
Weighted Average Exercise Price, Outstanding $ 9.10 $ 9.38
Weighted Average Exercise Price, Vested 9.10 9.38
Weighted Average Exercisable, Exercise Price $ 9.10 $ 9.38
Weighted Average Remaining Life, Outstanding 42 months 57 months
Weighted Average Remaining Contractual Life, Vested 42 months 57 months
Weighted Average Remaining Contractual Life, Exercisable 42 months 57 months
Intrinsic Value, Outstanding $ 2,338 $ 4,853
Intrinsic Value, Vested 2,338 4,853
Intrinsic Value, Exercisable $ 2,338 $ 4,853