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Derivative Financial Instruments (Details) (USD $)
Jun. 30, 2012
Dec. 31, 2011
Components of derivative liabilities    
Derivative liabilities $ 12,077,964 $ 7,333,293
Common shares linked to derivative liabilities 9,333,300 6,440,880
Embedded derivatives [Member]
    
Components of derivative liabilities    
Derivative liabilities 5,198,882 2,680,133
Common shares linked to derivative liabilities 5,445,800 2,813,797
Warrant derivatives [Member]
    
Components of derivative liabilities    
Derivative liabilities 6,879,082 4,653,160
Common shares linked to derivative liabilities 3,887,500 3,627,083
Senior Convertible Notes [Member] | Embedded derivatives [Member]
    
Components of derivative liabilities    
Derivative liabilities 4,912,547 2,521,422
Common shares linked to derivative liabilities 5,305,800 2,673,797
Senior Convertible Notes [Member] | Warrant derivatives [Member]
    
Components of derivative liabilities    
Derivative liabilities 3,191,407 1,898,785
Common shares linked to derivative liabilities 1,562,500 1,302,083
Series G Convertible Preferred Stock [Member] | Embedded derivatives [Member]
    
Components of derivative liabilities    
Derivative liabilities 286,335 158,711
Common shares linked to derivative liabilities 140,000 140,000
Series G Convertible Preferred Stock [Member] | Warrant derivatives [Member]
    
Components of derivative liabilities    
Derivative liabilities $ 3,687,675 $ 2,754,375
Common shares linked to derivative liabilities 2,325,000 2,325,000