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Warrants (Tables)
9 Months Ended
Sep. 30, 2012
Warrants [Abstract]  
Warrants to purchase common stock issued and outstanding
                         

Year Issued

  Classification   Number of     Exercise
Price
    Date of Expiration
    Warrants      

2010

  Derivative     13,537,994     $ 1.40     10/26/2015-12/3/2015

2010

  Derivative     1,967,858     $ 1.00     9/26/2015-12/3/2015

2011

  Equity     16,071     $ 1.40     6/17/2018

2011

  Equity     343,137     $ 3.06     12/21/2016
       

 

 

             

Total

        15,865,060              
       

 

 

             
         

Weighted average exercise price

              $ 1.39      
               

 

 

     
         

Weighted average life in years

                      3.18