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Warrants (Tables)
12 Months Ended
Dec. 31, 2015
Warrants Tables  
Warrant activity and summary

The following summarizes activity with respect to our common stock warrants for the periods shown below (in thousands);

            Warrants to     Weighted-
            purchase     average
            common     exercise
            shares     price
Outstanding at December 31, 2012           5,131    $ 7.28 
Granted:                  
     Exercise price less than intrinsic value           2,216      2.71 
     Exercise price greater than intrinsic value           1,855      2.44 
Exercised           (358)     1.77 
Canceled/expired           (753)     28.80 
Outstanding at December 31, 2013           8,091      3.07 
Granted:                  
     Exercise price less than intrinsic value               -  
     Exercise price greater than intrinsic value           2,148      2.47 
Exercised           (3,713)     2.67 
Canceled/expired               -  
Outstanding at December 31, 2014           6,526      3.08 
Granted:                  
     Exercise price less than intrinsic value               -  
     Exercise price greater than intrinsic value               -  
Exercised           (1,487)     2.19 
Canceled/expired               -  
Outstanding at December 31, 2015           5,039    $ 3.34 
                   
Exercisable at December 31, 2015           5,039    $ 3.34 

 

The following table summarizes information about our common stock warrants outstanding and exercisable at December 31, 2015 (in thousands):

      Warrants outstanding     Warrants exercisable
            Weighted-                  
            average     Weighted-           Weighted-
      Outstanding at     remaining     average     Exercisable at     average
      December 31,     contractual term     exercise     December 31,     exercise
Range of exercise prices     2015     (in years)     price     2015     price
                               
$2.01-$3.08     3,761      2.39    $ 2.36      3,761    $ 2.36 
$6.24-$10.24     1,278      0.88      6.24      1,278      6.24 
$2.01-$10.24     5,039                  5,039