Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Tables)

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Fair Value Measurements (Tables)
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Schedule of Fair Value, Financial Assets and Liabilities [Table Text Block]
      Fair value measurement using  
            Significant     Significant        
      Quoted prices in     other     unobservable        
      active markets     observable     inputs        
($ rounded to nearest thousand)     (Level 1)     inputs (Level 2)     (Level 3)     Total  
Balance at Sept. 30, 2015                          
Assets:                          
Cash and cash equivalents   $ 1,676,000   $   —   $   —   $ 1,676,000  
Liabilities:                          
Warrant liability   $   —   $   —   $ 1,892,000   $ 1,892,000  
      Fair value measurement using  
            Significant     Significant        
      Quoted prices in     other     unobservable        
      active markets     observable     inputs        
($ rounded to nearest thousand)     (Level 1)     inputs (Level 2)     (Level 3)     Total  
Balance at December 31, 2014                          
Assets:                          
Cash and cash equivalents   $ 4,220,000   $   —   $   —   $ 4,220,000  
Liabilities:                          
Warrant liability   $   —   $   —   $ 4,633,000   $ 4,633,000  
Schedule of Reconciliation of Warrant Liability [Table Text Block]
($ rounded to nearest thousand)                                                                   Warrant Liability  
Balance at December 31, 2013 $ 1,711,000  
Issuance of additional warrants   4,416,000  
Exercise of warrants   (331,000 )
Change in fair value of warrant liability   (1,163,000 )
Balance at December 31, 2014   4,633,000  
Issuance of additional warrants   -  
Exercise of warrants   -  
Change in fair value of warrant liability   (2,741,000 )
Balance at September 30, 2015 $ 1,892,000