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COMMON STOCK AND WARRANTS. (Tables)
12 Months Ended
Dec. 31, 2018
Stockholders' Equity Note [Abstract]  
Schedule of warrant activity

The following table summarizes warrant activity for the years ended December 31, 2018, 2017 and 2016 (number of shares in thousands):

 

   Number of
Shares
   Price per
Share
  Weighted
Average
Exercise Price
 
Balance at December 31, 2015   382   $6.09 – $735.00  $70.87 
Warrants exercised   (138)  $8.43  $8.43 
Balance at December 31, 2016   244   $6.09 – $735.00  $106.72 
Warrants exercised   (191)  $6.09  $6.09 
Warrants expired   (49)  $6.09 – $735.00  $444.00 
Balance at December 31, 2017   4   $735.00  $735.00 
Warrants expired   (4)  $735.00  $735.00 
Balance at December 31, 2018      $—  $