Annual report pursuant to Section 13 and 15(d)

Stock Option Plans (Additional Information) (Detail)

v3.3.1.900
Stock Option Plans (Additional Information) (Detail) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Exercisable Options Outstanding Shares 424,688  
Weighted average exercise price per share $ 5.34  
Unvested Options Outstanding, Shares 598,101 462,765
Unvested Options Outstanding, Weighted average exercise price $ 4.05  
Unvested Options Outstanding Weighted average remaining life (yrs) 7 years 4 months 24 days  
Weighted average remaining contractual term on unvested options 7 years 4 months 24 days  
Unrecognized stock compensation expense $ 2,186,000 $ 1,100,000
Weighted average recognition period 2 years 2 months 12 days  
Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Shares Authorized 1,767,084  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 10 years  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value $ 3,449,805  
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 1,608,795 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%