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Stock Compensation - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Apr. 30, 2015
Apr. 26, 2007
Stock Option [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Shares, Granted 0 2,259 0 6,618      
Option expiry term (Years)     10 years        
Stock-based compensation expense $ 2,000 $ 6,000 $ 8,000 $ 19,000      
Expected additional expense for 2016 1,000   1,000        
Expected additional expense for 2017 1,000   $ 1,000        
Weighted-average recognition period of nonvested stock options expense     6 months        
Weighted average remaining life for outstanding stock     3 years 7 months 6 days        
Exercise price range, lower range limit     $ 1.20        
Exercise price range, upper range limit     $ 5.89        
Restricted Stock [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Stock-based compensation expense 254,000 183,000 $ 716,000 549,000      
Expected additional expense for 2016 240,000   240,000        
Expected additional expense for 2017 $ 614,000   $ 614,000        
Nonvested shares 343,178   343,178   260,490    
Vested shares during 2016     9,976        
Vested shares during 2017     142,003        
Vested shares during 2018     97,928        
Vested shares during 2019     93,271        
Expected additional expense for 2018 $ 409,000   $ 409,000        
Expected additional expense for 2019 $ 136,000   $ 136,000        
Total average per share fair value of shares vested     $ 5.87        
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  
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   3,569,766        
Executive Incentive Plan [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Percentage of amount paid in cash     80.00%        
Percentage of amount paid in restricted stock     20.00%        
Executive Incentive Plan [Member] | Restricted Stock [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Stock-based compensation expense $ 96,000 63,000 $ 265,000 193,000      
Executive 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        
Executive Incentive Plan [Member] | Cash Portion [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Stock-based compensation expense 306,000 244,000 $ 924,000 731,000      
Long Term Incentive Plan [Member]              
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]              
Stock-based compensation expense $ 96,000 $ 1,000 $ 289,000 $ 72,000