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Fair Value of Assets and Liabilities (Tables)
6 Months Ended
Jun. 30, 2012
Fair Value of Assets and Liabilities [Abstract]  
Assets and liabilities measured at fair value on a recurring basis
                                 
    June 30, 2012  
    Level 1     Level 2     Level 3     Fair Value  

Liabilities:

                               

Derivative warrant liability

  $ —       $ 23,527,882     $ —       $ 23,527,882  
   

 

 

   

 

 

   

 

 

   

 

 

 

 

                                 
    December 31, 2011  
    Level 1     Level 2     Level 3     Fair Value  

Liabilities:

                               

Derivative warrant liability

  $ —       $ 35,473,230     $ —       $ 35,473,230