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Preferred Stock Warrants and Warrant Liability - Additional Information (Detail) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2011 | Sep. 30, 2011
Changes In Fair Value Of Warrants [Line Items] |  |
Income related to change in the fair value of warrant liability | $ 62,305 |
Total balance of the warrant liability |  | $ 2,607,510

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- Definition Loss gain from change in fair value of warrant liability. + References No definition available. + Details
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