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Bank Loan - Additional Information (Detail) - US Bank National Association Loan [Member]
3 Months Ended 9 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
Installment
Jun. 30, 2014
USD ($)
Nov. 01, 2013
USD ($)
Oct. 26, 2012
USD ($)
Debt Instrument [Line Items]            
Long-term loan outstanding principal balance           $ 1,900,000
Additional borrowings           16,300,000
Outstanding bank loan         $ 30,000,000 $ 18,400,000
Monthly payments     P47M      
Number of monthly installments payable | Installment     47      
Required monthly loan principal repayment     $ 312,500      
Debt instrument, stated interest rate 3.25%   3.25%      
Spread on reference rate     0.75%      
Effective interest rate on debt 4.00%   4.00%      
Final installment date     Oct. 26, 2017      
Increase in outstanding loan         $ 13,300,000  
Amortized loan costs     $ 376,226      
Amortized cost on straight-line basis in months     60 months      
Amortization expenses $ 21,624 $ 21,624 $ 64,871 $ 61,703    
Unamortized loan cost $ 201,822   $ 201,822