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Stock Compensation - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Apr. 30, 2015
Apr. 26, 2007
Stock Option [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Outstanding nonvested stock options 0        
Weighted average remaining life for outstanding stock 3 years 8 months 26 days        
Exercise price range, lower range limit $ 1.20        
Exercise price range, upper range limit $ 9.66        
Restricted Stock [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock-based compensation expense $ 143,000 $ 242,000      
Expected additional expense for 2019 $ 364,000        
Nonvested shares 128,337   210,713    
Expected to vest shares during remainder of 2019 32,769        
Expected to vest shares during 2020 32,444        
Expected to vest shares during 2021 59,551        
Expected to vest shares during 2022 3,573        
Expected additional expense for 2020 $ 289,000        
Expected additional expense for 2021 134,000        
Expected additional expense for 2022 $ 39,000        
Total average per share fair value of shares vested $ 9.66        
2015 Long Term Incentive Compensation Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Authorized shares of stock, option plan, maximum       1,200,000  
2015 Long Term Incentive Compensation Plan [Member] | Stock Option [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Shares, Granted 0 50,000      
Option expiry term (Years) 10 years        
Stock-based compensation expense $ 6,000 $ 13,000      
Expected additional expense for 2019 $ 0        
2007 Long-Term Incentive Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Authorized shares of stock, option plan, maximum         2,000,000
1999 Long-Term Incentive Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Authorized shares of stock, option plan, maximum 3,569,766        
Annual Incentive Plan [Member] | Restricted Stock [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock-based compensation expense $ 103,000 95,000      
Annual Incentive Plan [Member] | Restricted Stock [Member] | Beginning on first anniversary of issue date [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock-based compensation vesting period 3 years        
Annual Incentive Plan [Member] | Cash Portion [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock-based compensation expense $ 700,000 445,000      
Long Term Incentive Plan [Member]          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Stock-based compensation expense $ 182,000 $ 169,000