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Warrant Liabilities (Tables)
 3 Months Ended
Mar. 31, 2014
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,
 
 
 
2014
  
2013
 
 
 
  
 
Risk-free interest rate
  
0.63
%
  
0.45
%
Expected dividend yield
  
0
%
  
0
%
Expected lives
  
2.21
   
3.21
 
Expected volatility
  
85.7
%
  
69.0
%
Warrants classified as liabilities (in shares)
  
6,984,716
   
6,984,716
 
Gain (loss) on warrant liabilities
 
$
14,702,904
  
$
(2,095,220
)