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Fair Value Measurements - Reconciliation of Derivative Liability (Detail) - Warrant - USD ($)
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]      
Value, Beginning balance $ 1,565,874    
Change in value (870,760) $ 293,072 $ (2,684,712)
Value, Ending balance $ 695,114 $ 1,565,874