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Warrant Liabilities (Tables)
 3 Months Ended
Mar. 31, 2015
Warrant Liabilities [Abstract]  
Schedule of weighted-average assumptions
The following reflects the weighted-average assumptions for each of the three-month periods indicated:
  
Three Months Ended March 31,
 
  
2015
  
2014
 
     
Risk-free interest rate
  
0.41
%
  
0.63
%
Expected dividend yield
  
0
%
  
0
%
Expected lives
  
1.34
   
2.21
 
  Expected volatility
  
92.4
%
  
85.7
%
  Warrants classified as liabilities (in shares)
  
6,371,854
   
6,984,716
 
Gain (loss) on warrant liability
 
$ 
(1,871,294
)
 
$
14,702,904