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Derivative Financial Instruments (Details) (USD $) | Mar. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Components of derivative liabilities |  |
Derivative liabilities | $ 6,018,613 | $ 5,356,203
Common shares linked to derivative liabilities | 7,268,815 | 8,059,843
Warrant derivatives [Member] |  |
Components of derivative liabilities |  |
Derivative liabilities | 4,286,356 | 3,826,620
Common shares linked to derivative liabilities | 3,812,500 | 3,812,500
Senior Convertible Notes [Member] | Compound embedded derivative [Member] |  |
Components of derivative liabilities |  |
Derivative liabilities | 1,732,257 | 1,529,583
Common shares linked to derivative liabilities | 3,456,315 | 4,247,343
Senior Convertible Notes [Member] | Warrant derivatives [Member] |  |
Components of derivative liabilities |  |
Derivative liabilities | 1,973,281 | 1,921,094
Common shares linked to derivative liabilities | 1,562,500 | 1,562,500
Series G Convertible Preferred Stock [Member] | Warrant derivatives [Member] |  |
Components of derivative liabilities |  |
Derivative liabilities | $ 2,313,075 | $ 1,905,526
Common shares linked to derivative liabilities | 2,250,000 | 2,250,000

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