Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Additional Information (Detail)

v3.5.0.2
Stock-Based Compensation - Additional Information (Detail)
1 Months Ended 9 Months Ended
May 31, 2014
$ / shares
shares
Sep. 30, 2016
USD ($)
stock_plan
shares
Oct. 11, 2016
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of equity incentive plans | stock_plan   2  
Options granted maximum exercisable period (up to)   10 years  
Employees      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost related to non-vested stock options granted | $   $ 3,346,608  
Unrecognized compensation cost related to non-vested stock options granted expect to recognize, period (in years)   2 years 5 months 19 days  
Non-Employee      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized compensation cost related to non-vested stock options granted | $   $ 35,625  
Unrecognized compensation cost related to non-vested stock options granted expect to recognize, period (in years)   1 year 3 months  
Director      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Issuance of shares under stock options issued (in shares) 200,000    
Exercise price of options exchanged (usd per share) | $ / shares $ 15.89    
2011 Equity Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for future awards (in shares)   686,897  
2008 Stock Option Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for future awards (in shares)   112,055  
Stock appreciation rights      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation, equity instruments other than options granted (in shares)   0  
Restricted shares of common stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation, equity instruments other than options granted (in shares)   275,500  
Unrecognized compensation cost related to non-vested stock options granted expect to recognize, period (in years)   1 year 11 months 12 days  
Unrecognized compensation cost | $   $ 444,329  
Subsequent Event | 2011 Equity Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized (in shares)     3,150,000