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Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 30, 2015
Summary of Significant Accounting Policies [Abstract]  
Calculation of diluted net loss per common share
In accordance with Accounting Standards Codification Topic 260 (ASC 260), Earnings per Share, when calculating diluted net loss per common share, a gain associated with the decrease in the fair value of warrants classified as derivative liabilities results in an adjustment to the net loss; and the dilutive impact of the assumed exercise of these warrants results in an adjustment to the weighted average common shares outstanding.  We utilize the treasury stock method to calculate the dilutive impact of the assumed exercise of warrants classified as derivative liabilities.

(in thousands)
 
Three Months Ended
June 30,
  
Six Months Ended
June 30,
 
  
2015
  
2014
  
2015
  
2014
 
         
Numerator:
        
Net loss as reported
 
$
(11,326
)
 
$
(10,623
)
 
$
(23,505
)
 
$
(22,099
)
Less: income from change in fair value of warrant liability
  
(469
)
  
(1,447
)
  
(438
)
  
(1,820
)
Numerator for diluted net loss per common share
 
$
(11,795
)
 
$
(12,070
)
 
$
(23,943
)
 
$
(23,919
)
                 
Denominator:
                
Basic weighted average common shares outstanding
  
85,753
   
85,061
   
85,671
   
84,766
 
Dilutive common shares from assumed warrant exercises
  
–
   
821
   
–
   
1,345
 
Diluted weighted average common shares outstanding
  
85,753
   
85,882
   
85,671
   
86,111