Annual report pursuant to Section 13 and 15(d)

Stock Option Plans (Additional Information) (Detail)

v3.6.0.2
Stock Option Plans (Additional Information) (Detail) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Exercisable Options Outstanding Shares 613,665    
Weighted average exercise price per share $ 4.83    
Unvested Options Outstanding, Shares 470,633    
Unvested Options Outstanding, Weighted average exercise price $ 4.67    
Unvested Options Outstanding Weighted average remaining life (yrs) 8 years 4 months 24 days    
Weighted average remaining contractual term on unvested options 7 years    
Unrecognized stock compensation expense $ 2,080,180 $ 2,186,000  
Weighted average recognition period 2 years 4 months 24 days    
Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Shares Authorized 2,111,673    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 2,776,068    
Non Employee Director      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Percentage Of Stock Option Vesting Period 50.00%    
stock option plans [Member]      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Unvested Options Outstanding, Shares   598,101  
2014 Plan      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Percentage Of Stock Option Vesting Period 20.00%    
Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Shares Authorized 1,956,925   1,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum 10.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 100.00%