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Fair Value Measurement (Details 1) (USD $)
 9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Fair Value, Measurements [Member]
    
Roll forward for financial assets and liabilities measured at fair value using significant other observable inputs (Level 2)    
Investments, Fair Value Disclosure $ 21,463,358  
Marketable debt securities, ending Balance 21,463,358  
Fair Value Measurement With Unobservable inputs reconciliation recurring basis asset transfers into level 1 2,751,144  
Liabilities Measured at Fair Value, ending balance 14,864,398  
Marketable debt securities [Member]
    
Roll forward for financial assets and liabilities measured at fair value using significant other observable inputs (Level 2)    
Investments, Fair Value Disclosure 6,031,735 3,280,591
Marketable debt securities, ending Balance 6,031,735 3,280,591
Bond obligation [Member]
    
Roll forward for financial assets and liabilities measured at fair value using significant other observable inputs (Level 2)    
Financial liabilities change settled in earning fair value disclosure (141,250)  
Liabilities Measured at Fair Value, ending balance 381,250 522,500
Warrant liabilities [Member]
    
Roll forward for financial assets and liabilities measured at fair value using significant other observable inputs (Level 2)    
Financial liabilities change included in earning fair value disclosure 203,293  
Liabilities Measured at Fair Value, ending balance $ 234,488 $ 31,195