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Derivative Financial Instruments (Details 1) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Changes in fair values of derivative liabilities        
Derivative (expense) income $ (3,212,901) $ 704,562 $ (3,089,832) $ (584,622)
Derivatives Warrant [Member]
       
Changes in fair values of derivative liabilities        
Derivative (expense) income (1,512,479) 227,925 (1,862,380) (139,275)
Senior Convertible Notes [Member]
       
Changes in fair values of derivative liabilities        
Derivative (expense) income (1,611,725)   (1,099,828)   
Series G Convertible Preferred Stock [Member]
       
Changes in fair values of derivative liabilities        
Derivative (expense) income $ (88,697) $ 476,637 $ (127,624) $ (445,347)