Quarterly report pursuant to Section 13 or 15(d)

Stock Based Compensation Plans (Additional Information) (Detail)

v3.8.0.1
Stock Based Compensation Plans (Additional Information) (Detail) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]          
Exercisable Options Outstanding Shares 716,046   716,046    
Weighted average exercise price per share $ 4.63   $ 4.63    
Unvested Options Outstanding, Shares 701,763   701,763    
Unvested Options Outstanding, Weighted average exercise price     $ 5.41    
Unvested Options Outstanding Weighted average remaining life (yrs)     8 years 8 months 12 days    
Weighted average remaining contractual term on unvested options     6 years 8 months 12 days    
Unrecognized stock compensation expense $ 3,512,000   $ 3,512,000    
Weighted average recognition period     3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term     7 years 8 months 12 days   7 years 7 months 6 days
Share-Based Compensation 425,000 $ 192,000 $ 912,102 $ 540,843  
Executive Officer [Member]          
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]          
Unrecognized stock compensation expense $ 531,000   $ 531,000    
Weighted average recognition period     3 years 7 months 6 days    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested Issued , Number     100,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, NonVested in Period, Fair Value     $ 590,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 5.90