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Stock-Based Compensation - Additional Information (Detail) - USD ($)
3 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Sep. 30, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Options Outstanding 5,465,784   5,435,640
Number of Options Outstanding, Granted 82,000    
Stock-based compensation expense $ 2,380,343 $ 2,014,856  
Share-based compensation, description At vesting, each RSU will be exchanged for one share of the Company’s Common Stock. Restricted stock unit awards generally vest subject to the satisfaction of service requirements or the satisfaction of both service requirements and achievement of certain performance targets.    
Employee Stock Option      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Stock-based compensation expense $ 1,217,217 981,399  
Grant date fair value of the options granted 365,876 3,596,618  
Intrinsic value of options exercised 3,515 $ 23,774  
Unrecognized pre-tax compensation expense $ 10,850,029    
Weighted average period to recognize pre-tax compensation expense 2 years 6 months    
Dividend yield 0.00%    
Restricted Stock Units (RSUs)      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of restricted stock units outstanding, granted 0 30,000  
Stock-based compensation expense $ 1,163,126 $ 1,033,457  
Weighted average period to recognize pre-tax compensation expense 1 year 8 months 12 days    
Unrecognized pre-tax compensation expense $ 2,529,700    
2004 Equity Incentive Plan      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Shares reserve for issuance 2,537,018    
2004 Equity Incentive Plan | Employee Stock Option      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Options Outstanding 2,537,018    
Number of Options Outstanding, Granted 0    
2004 Equity Incentive Plan | Restricted Stock Units (RSUs)      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of restricted stock units outstanding, granted 0    
2013 Incentive Plan      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Shares reserve for issuance 5,084,284    
2013 Incentive Plan | Employee Stock Option      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Options Outstanding 2,384,144    
Number of Options Outstanding, Granted 82,000    
2013 Incentive Plan | Restricted Stock Units (RSUs)      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of restricted stock units outstanding 877,500    
Number of restricted stock units outstanding, granted 0    
Outside Of Equity Compensation Plans      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Shares reserve for issuance 544,622    
Outside Of Equity Compensation Plans | Employee Stock Option      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of Options Outstanding, Granted 0    
Outside Of Equity Compensation Plans | Restricted Stock Units (RSUs)      
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]      
Number of restricted stock units outstanding 46,667    
Number of restricted stock units outstanding, granted 0    
Units granted outside of Equity Incentive plans   30,000