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Derivative Financial Instruments - Components of Derivative Liabilities (Detail) (USD $) | Mar. 31, 2014 | Dec. 31, 2013
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Derivative [Line Items] |  |
Derivative liabilities | $ 1,153,536 | $ 970,823
Common shares linked to derivative liabilities | 2,831,437 | 3,817,147
Compound Embedded Derivative [Member] |  |
Derivative [Line Items] |  |
Derivative liabilities |  | 47,243
Common shares linked to derivative liabilities | 743,937 | 1,729,647
Warrant Derivatives [Member] |  |
Derivative [Line Items] |  |
Derivative liabilities | 1,153,536 | 923,580
Common shares linked to derivative liabilities | 2,087,500 | 2,087,500
Senior Convertible Notes [Member] | Compound Embedded Derivative [Member] |  |
Derivative [Line Items] |  |
Derivative liabilities |  | 47,243
Common shares linked to derivative liabilities | 743,937 | 1,729,647
Senior Convertible Notes [Member] | Warrant Derivatives [Member] |  |
Derivative [Line Items] |  |
Derivative liabilities | 858,906 | 840,000
Common shares linked to derivative liabilities | 1,562,500 | 1,562,500
Series G Convertible Preferred Stock [Member] | Warrant Derivatives [Member] |  |
Derivative [Line Items] |  |
Derivative liabilities | $ 294,630 | $ 83,580
Common shares linked to derivative liabilities | 525,000 | 525,000

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