Annual report pursuant to Section 13 and 15(d)

Stock Compensation Plan - Additional Information (Detail)

v3.6.0.2
Stock Compensation Plan - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares authorized under the incentive plan 4,000,000    
Shares available for future stock option 291,015    
Shares issued under incentive plan 2,087,462    
Number of stock options outstanding 1,621,523 1,471,031 820,865
Shares available for future issuance 1,912,538    
Expiration period 10 years    
Unrecognized compensation costs $ 365,744    
Weighted average period over which unrecognized compensation costs are expected to be recognized 1 year 1 month 6 days    
Total grant date fair value of options vested $ 572,786 $ 325,361  
Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares vesting period 3 years    
Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares vesting period 2 years    
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense $ 472,780 $ 770,704