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Acquisitions - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended | 12 Months Ended | 128 Months Ended
--- | --- | --- | --- | ---
Oct. 21, 2011 | Dec. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2013 | Dec. 31, 2013
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 - fair value adjustments |  |  |  | 1,400,000 | 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 |  |  | 90 days
Percentage of royalty liability |  | 3.00% |  |  | 3.00%
Cash payments to Roche, minimum |  | 2,500,000 |  |  | 2,500,000
Cash payments to Roche, maximum |  | $ 6,000,000 |  |  | $ 6,000,000

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