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Warrants and Warrant Derivative Liability (Tables)
3 Months Ended
Mar. 31, 2013
Warrants to Purchase Common Shares Outstanding

The Company had 9,866,826 warrants to purchase common shares outstanding at March 31, 2013 at a weighted-average exercise price of $1.44, as summarized in the following table:

 

Issue Date

 

Amount

 

Exercise Price

 

Expiration Date

4/27/07

  17,500   17.90   1/17/14

7/31/09

  1,734,888   1.00   7/30/14

10/16/09

  7,487,388   1.50   10/15/14

10/16/09

  627,050   1.50   10/15/14
 

 

 

 

 
  9,866,826   $1.44