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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