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Derivative Financial Instruments (Details 5) (Derivatives Warrant [Member], USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Derivatives Warrant [Member]
   
Changes in fair value inputs and assumptions    
Balances at January 1 $ 3,826,619 $ 4,653,160
Changes in fair value inputs and assumptions reflected in income 459,737 349,901
Balances at March 31 $ 4,286,356 $ 5,003,061