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Acquisitions - Additional Information (Detail) (USD $) | 1 Months Ended | 12 Months Ended | 125 Months Ended |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 21, 2012 | Oct. 21, 2011 | Sep. 30, 2013 | Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2013 Roche | Oct. 21, 2011 Roche | Sep. 30, 2013 Roche Minimum | Sep. 30, 2013 Roche Maximum | Apr. 05, 2012 Alvos acquisition
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Issue of promissory note to Roche |  |  |  |  |  |  |  | $ 50,000 |  |  |
Shares issued |  |  |  |  |  |  |  | 1,288,158 |  |  | 315,457
Applicable out-license term |  |  |  |  |  |  | 90 days |  |  |  |
Percentage of royalty liability |  |  |  |  |  |  | 3.00% |  |  |  |
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. |  |  |  |  |  |  |  |
Cash payments to Roche |  |  |  |  |  |  |  |  | 2,500,000 |  |
Cash payments to Roche |  |  |  |  |  |  |  |  |  | 6,000,000 |
Net present value of contingent consideration |  | 84,935 |  |  |  |  |  |  |  |  |
Gain on purchase |  |  |  |  |  |  | 1,576,106 |  |  |  |
Issue of additional shares of Common Stock, Value |  |  |  |  |  |  |  |  |  |  | 23,500,000
Contingent consideration |  |  | 1,595,273 | 1,595,273 | 173,621 |  |  | 84,935 |  |  | 88,686
Contingent consideration – fair value adjustments | $ (986,049) |  | $ 1,421,652 | $ 1,421,652 |  |  |  |  |  |  |

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