Quarterly report pursuant to Section 13 or 15(d)

13. Warrants (Tables)

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13. Warrants (Tables)
3 Months Ended
Mar. 31, 2016
Warrants Tables  
Common stock warrants
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       0.11     $ 3.30       11,364     $ 3.30  
  1.25       26,302       0.42       1.25       26,302       1.25  
  1.00       1,642,680       1.19       1.00       1,642,680       1.00  
  0.87       1,303,300       3.11       0.87       1,303,300       0.87  
  0.65       515,000       2.58       0.65       515,000       0.65  
  0.50       12,743,728 *     3.37       0.50       12,743,728       0.50  
  0.48       577,750       2.52       0.48       577,750       0.48  
  0.35       12,787,087 *     3.96       0.35       12,787,087       0.35  
$ 0.50 - $3.30       29,607,211       3.46               29,607,211