v3.2.0.727
Stock Based Compensation - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Aug. 31, 2012
Jun. 30, 2015
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Outstanding shares remained available for future grants   308,821 308,821    
Outstanding options to purchase shares of common stock   64,000 64,000   101,000
Stock-based compensation expense   $ 92,000 $ 235,000 $ 124,000  
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unvested restricted shares outstanding   165,491 165,491   268,985
Unrecognized compensation cost   $ 384,000 $ 384,000    
Number of restricted shares vested     103,494    
Intrinsic value of restricted shares vested     $ 370,000    
Common stock cancelled in payment of payroll taxes due on vesting of restricted shares under employee stock incentive plans (in shares)     9,998    
Tax withholding obligations     $ 35,000    
Unrecognized stock-based compensation expense are expected to be recognized over a weighted average periods (years)     1 year 6 months    
Restricted shares outstanding expected to vest   165,491 165,491    
Aggregate intrinsic value   $ 610,662 $ 610,662    
Restricted Stock | Scenario, Adjustment          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of restricted shares vested     103,494    
Unvested Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost   $ 0 $ 0    
Service Contingent Restricted Stock | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     3 years    
Service Contingent Restricted Stock | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period     4 years    
Performance Contingent Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unvested restricted shares outstanding   165,491 165,491    
2012 Equity Incentive Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares initially authorized for issuance under equity incentive plan 300,000        
Additional shares authorized for issuance under equity incentive plan 17,666        
Outstanding shares remained available for future grants   419,330 419,330    
Previously Approved Plans          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares ceased to be issuable 17,666        
2012 Plan and Previously Approved Plans          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Outstanding options to purchase shares of common stock   64,000 64,000    
2012 Plan and Previously Approved Plans | Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unvested restricted shares outstanding   165,491 165,491