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Fair Value Measurements - Additional Information (Detail) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 USD ($) shares | Sep. 30, 2016 USD ($) shares | Sep. 30, 2015 USD ($) | Sep. 30, 2011 shares | Jan. 31, 2013 shares | Dec. 31, 2012 shares | Jun. 30, 2010 shares
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Warrants outstanding | 432,284 |  |  |  |  |  |
Derivative liability remaining | $ | $ 695,114 | $ 1,602,626 |  |  |  |  |
Contingent consideration obligations | $ | 0 | $ 0 |  |  |  |  |
Exchange rights | Ablaris Therapeutics |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Warrants outstanding |  | 500,000 |  |  |  |  |
Non-cash gain (loss) from change in fair value of the derivative liability | $ | $ 19,602 | $ (7,950) | $ 184,555 |  |  |  |
Duration of exchange rights | 7 years |  |  |  |  |  |
Exchange right convertible conversion ratio | 0.01 |  |  |  |  |  |
Number of exchange rights exercised | 500,000 |  |  | 675,000 |  |  |
Derivative liability remaining | $ | $ 0 |  |  |  |  |  |
2010 Warrants |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Warrants issued to acquire Common Stock |  |  |  |  |  |  | 329,649
Warrants cancelled upon expiration |  | 24,324 |  |  |  |  |
2012 Warrants |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Warrants issued to acquire Common Stock |  |  |  |  |  | 912,543 |
Warrants outstanding | 265,161 |  |  |  |  |  |
2013 Warrants |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Warrants issued to acquire Common Stock |  |  |  |  | 833,530 |  |
Warrants outstanding | 12,123 |  |  |  |  |  |
Warrant |  |  |  |  |  |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Non-cash gain (loss) from change in fair value of the derivative liability | $ | $ 870,760 | $ (293,072) | $ 2,684,712 |  |  |  |

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