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Accounting for Stock- Based Compensation - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of restricted stock units issued 897,300 194,704 36,300  
Number of stock options issued 1,200,900 208,000 73,600  
Weighted average vesting period for unrecognized compensation cost       2 years 10 months 24 days
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share based payment award , vesting period 4 years 4 years 4 years  
Fair value of the stock options granted , value $ 2,910,767 $ 603,802 $ 382,720  
Weighted average grant date fair value of the stock options granted $ 2.42 $ 2.90 $ 5.20  
Unrecognized compensation cost related to non vested stock options $ 7,900,000     $ 7,900,000
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair value of Restricted stock options granted , value $ 3,508,443 $ 901,480 $ 262,086  
Weighted average grant date fair value of the stock options granted $ 3.91 $ 4.63 $ 7.22  
Unrecognized compensation cost related to non vested stock options $ 8,600,000     $ 8,600,000