Quarterly report pursuant to Section 13 or 15(d)

13. Warrants (Tables)

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13. Warrants (Tables)
6 Months Ended
Jun. 30, 2015
Warrants Tables  
Common stock warrants

The following table summarizes information about common stock warrants outstanding at June 30, 2015:

 

Outstanding     Exercisable  
Exercise
Price
    Number
Outstanding 
    Weighted Average Remaining Contractual Life (years)      Weighted Average Exercise Price      Number Exercisable      Weighted Average Exercise Price     
$ 3.30       11,364       0.87     $ 3.30       11,364     $ 3.30    
  1.25       40,252       0.85       1.25       40,252       1.25    
  1.00       1,233,022       1.92       1.00       1,233,022       1.00    
  0.88 (1)     1,303,300       3.86       0.88       1,303,300       0.88    
  0.84 (2)     959,508       4.13       0.84       959,508       0.84    
  0.75       435,271       0.03       0.75       435,271       0.75    
  0.67 (3)     3,805,000       3.28       0.67       3,805,000       0.67    
  0.50       14,077,750       4.09       0.50       14,077,750       0.50    
  $0.50 - $3.30       21,865,467       3.73               21,865,467