v3.4.0.3
Stock-Based Compensation - Additional Information (Detail)
3 Months Ended
Mar. 31, 2016
USD ($)
Plans
shares
Mar. 31, 2015
USD ($)
shares
Dec. 31, 2015
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of equity incentive plans | Plans 2    
Shares outstanding under equity incentive plans 1,257,000   1,257,000
Shares available for grant under equity incentive plans 0 0  
Expense related to options granted under equity incentive plan | $ $ 77,000 $ 51,000  
Unrecognized compensation expense related to non-vested stock options | $ $ 341,000    
Recognition of unrecognized compensation expense, weighted-average period (in years) 1 year 6 months 4 days    
Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option exercisable period 7 years    
2006 Equity Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares outstanding under equity incentive plans 942,000    
Shares available for grant under equity incentive plans 0    
2015 Equity Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares outstanding under equity incentive plans 315,000    
Shares available for grant under equity incentive plans 899,000