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Commitments and contingencies (Tables)
 12 Months Ended
Dec. 31, 2012
Fair Value of Stock Consideration
The final fair values of the stock consideration are summarized in the following table:

 

     Number
of
Shares		      Closing Price
Per Share on
Final
Approval
Date		      Final Fair Value  of
Stock
Consideration		  

Derivative Action

      225,000       $ 1.94       $ 436,500   

Securities Action

      2,777,778       $ 2.18         6,055,556   
  

 

 

        

 

 

  

Total

      3,002,778          $ 6,492,056