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Income Taxes - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Sep. 30, 2015
Income Taxes [Line Items]          
Deferred tax valuation allowance, percentage 100.00%   100.00%    
Accrued interest or penalties $ 0   $ 0   $ 0
Recognized income tax interest and/or penalties $ 0 $ 0 $ 0 $ 0  
Federal [Member]          
Income Taxes [Line Items]          
Net operating loss carryforwards will begin to expire     Sep. 30, 2018    
State [Member]          
Income Taxes [Line Items]          
Net operating loss carryforwards will begin to expire     Sep. 30, 2016