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Warrants and Derivative Liability (Tables)
3 Months Ended
Mar. 31, 2012
Warrants to Purchase Common Shares Outstanding

The Company had 21,066,363 warrants to purchase common shares outstanding at March 31, 2012 at a weighted-average exercise price of $1.48, as summarized in the following table:

 

Issue Date

   Amount      Exercise Price      Expiration Date  

4/27/07

     17,500         17.90         1/17/2014   

6/1/07

     55,737         7.20         5/31/12   

12/5/07

     516,300         1.17         12/3/12   

7/31/09

     138,888         1.00         7/30/14   

7/31/09

     1,666,000         1.00         7/30/14   

10/16/09

     18,024,888         1.50         10/15/14   

10/16/09

     647,050         1.50         10/15/14   
  

 

 

    

 

 

    
     21,066,363       $ 1.48