Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Tables)

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Fair Value Measurements (Tables)
 3 Months Ended 12 Months Ended
Mar. 31, 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        
      (Level 1)     inputs (Level 2)     (Level 3)     Total  
Balance at March 31, 2015                          
Assets:                          
Cash and cash equivalents   $ 3,171,530   $   —   $   —   $ 3,171,530  
Liabilities:                          
Warrant liability   $   —   $   —   $ 3,435,326   $ 3,435,326  
      Fair value measurement using  
            Significant     Significant        
      Quoted prices in     other     unobservable        
      active markets     observable     inputs        
      (Level 1)     inputs (Level 2)     (Level 3)     Total  
Balance at December 31, 2014                          
Assets:                          
Cash and cash equivalents   $ 4,220,225   $   —   $   —   $ 4,220,225  
Liabilities:                          
Warrant liability   $   —   $   —   $ 4,633,312   $ 4,633,312  
Schedule of Reconciliation of Warrant Liability [Table Text Block]
    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   (1,198,000 )
Balance at March 31, 2015   3,435,000