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Derivative Financial Instruments (Details) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Components of derivative liabilities    
Derivative liabilities $ 7,276,102 $ 7,333,293
Common shares linked to derivative liabilities 8,553,350 6,440,880
Embedded derivatives [Member]
    
Components of derivative liabilities    
Derivative liabilities 2,638,514 2,680,133
Common shares linked to derivative liabilities 4,665,850 2,813,797
Warrant derivatives [Member]
    
Components of derivative liabilities    
Derivative liabilities 4,637,588 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 2,638,514 2,521,422
Common shares linked to derivative liabilities 4,665,850 2,673,797
Senior Convertible Notes [Member] | Warrant derivatives [Member]
    
Components of derivative liabilities    
Derivative liabilities 2,369,063 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   158,711
Common shares linked to derivative liabilities   140,000
Series G Convertible Preferred Stock [Member] | Warrant derivatives [Member]
    
Components of derivative liabilities    
Derivative liabilities $ 2,268,525 $ 2,754,375
Common shares linked to derivative liabilities 2,325,000 2,325,000