Fair Value Measurements - Reconciliation of Derivative Liability (Detail) - Warrant - USD ($) |
12 Months Ended | ||
---|---|---|---|
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 |