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Acquisitions - Additional Information (Detail) (USD $) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Oct. 21, 2011 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Business Acquisition [Line Items] |  |  |  |
Obligation to pay royalties |  | later of (i) the expiration of the last to expire patent right related to such product candidate that was transferred in the Transaction and (ii) ten years after the first commercial sale of such product candidate. |  |
Net present value of contingent consideration | $ 84,935 |  |  |
Contingent consideration |  | 3,970,931 | 1,595,273 | 173,621
Contingent consideration - Fair Value Adjustments |  | 2,375,658 | 1,421,652 |
Roche Madison Inc |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Issue of promissory note to Roche | 50,000 |  |  |
Issue of Common Stock | 1,288,158 |  |  |
Applicable out-license term |  | 90 days |  |
Percentage of royalty liability |  | 3.00% |  |
Cash payments to Roche, minimum |  | 2,500,000 |  |
Cash payments to Roche, maximum |  | $ 6,000,000 |  |

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