Fair Value Measurements - Reconciliation of Derivative Liability (Detail) - Warrant - USD ($) |
3 Months Ended | 6 Months Ended | ||
---|---|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
Mar. 31, 2018 |
Mar. 31, 2017 |
|
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] | ||||
Value, Beginning balance | $ 695,114 | |||
Change in value | $ 18,598 | $ 25,883 | (432,141) | $ (1,428,948) |
Net settlements | $ (262,973) |