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Derivative Financial Instruments (Details 6) (Derivatives Warrant [Member], USD $)
6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Derivatives Warrant [Member]
   
Changes in fair value inputs and assumptions    
Balance at January 1 $ 4,653,160 $ 2,287,800
Issuances 363,542 906,150
Changes in fair value inputs and assumptions reflected in income 1,862,380 139,275
Balance at June 30 $ 6,879,082 $ 3,333,225