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Stockholders' Equity (Deficit) (Tables)
9 Months Ended
Sep. 30, 2018
Stockholders' Equity Note [Abstract]  
Schedule Of Warrant Activity [Table Text Block]
The following is a summary of warrant activity for the nine months ended September 30, 2018 (in thousands, except per share data):
 
          
  
Number of
  
Weighted Average
  
Remaining
 
  
Warrants
  
Exercise Price
  
Contractual Term
 
Outstanding as of January 1, 2018
  
320,406
  
$
0.50
   
2.62
 
Warrants granted  69,134   0.50     
Warrants exercised for cash  (8,957)  0.23     
Warrants expired and cancellation  (11,652)  1.22     
Outstanding as of September 30, 2018
  
368,931
  
$
0.29
   
2.21