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Fair Value Measurement (Details) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Fair value of warrant liabilities $ 215,853 $ 3,125,393
Fair Value, Inputs, Level 1 [Member]
   
Fair value of warrant liabilities      
Fair Value, Inputs, Level 2 [Member]
   
Fair value of warrant liabilities      
Fair Value, Inputs, Level 3 [Member]
   
Fair value of warrant liabilities $ 215,853 $ 3,125,393