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Warrants (Tables)
12 Months Ended
Dec. 31, 2012
Warrants  
Schedule of warrants outstanding

A summary of warrants outstanding at December 31, 2012, follows:

 
  Warrants Outstanding    
   
 
 
  Warrants Exercisable  
 
   
  Weighted
Average
Remaining
Contractual Life
(in years)
   
 
Exercise Price
  Number of
Shares
  Weighted
Average
Exercise
Price
  Number of
Shares
  Weighted
Average
Exercise
Price
 

$0.25 - $0.50

    1,847,500     0.8   $ 0.40     1,847,500   $ 0.40  

$0.51 - $1.00

    3,061,556     3.7   $ 0.78     3,061,556   $ 0.78  

$1.01 - $2.00

    636,737     1.6   $ 1.15     636,737   $ 1.15  

$2.01 - $4.35

    14,788     0.2   $ 3.38     14,788   $ 3.38  
                             

 

    5,560,581     2.5   $ 0.70     5,560,581   $ 0.70