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Derivative Financial Instruments - Components of Derivative Liabilities (Detail) (USD $) | Sep. 30, 2014 | Dec. 31, 2013
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Derivative [Line Items] |  |
Derivative liabilities | $ 1,125,749 | $ 970,823
Common shares linked to derivative liabilities |  | 3,817,147
Compound Embedded Derivative [Member] |  |
Derivative [Line Items] |  |
Derivative liabilities |  | 47,243
Common shares linked to derivative liabilities |  | 1,729,647
Warrant Derivatives [Member] |  |
Derivative [Line Items] |  |
Derivative liabilities | 1,125,749 | 923,580
Warrant and Share Purchase Option Derivatives [Member] |  |
Derivative [Line Items] |  |
Common shares linked to derivative liabilities | 1,562,500 | 2,087,500
Senior Convertible Notes [Member] | Compound Embedded Derivative [Member] |  |
Derivative [Line Items] |  |
Derivative liabilities |  | 47,243
Common shares linked to derivative liabilities |  | 1,729,647
Senior Convertible Notes [Member] | Warrant and Share Purchase Option Derivatives [Member] |  |
Derivative [Line Items] |  |
Derivative liabilities | 140,828 | 840,000
Common shares linked to derivative liabilities | 1,562,500 | 1,562,500
2014 Share Purchase Option [Member] | Warrant and Share Purchase Option Derivatives [Member] |  |
Derivative [Line Items] |  |
Derivative liabilities | 984,921 |
Series G Convertible Preferred Stock [Member] | Warrant and Share Purchase Option Derivatives [Member] |  |
Derivative [Line Items] |  |
Derivative liabilities |  | $ 83,580
Common shares linked to derivative liabilities |  | 525,000

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