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Fair Value Measurements - Reconciliation of Derivative Liability (Detail) - Warrant - USD ($) | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |  |
Value, Beginning balance | $ 695,114 |  |
Change in value | (432,141) | $ (870,760) | $ 293,072
Net settlements | $ (262,973) |  |
Value, Ending balance |  | $ 695,114 |

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