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Summary of Significant Accounting Policies (Tables)
 6 Months Ended
Jun. 30, 2014
Summary of Significant Accounting Policies [Abstract]  
Calculation of diluted net loss per common share
The table below provides information pertaining to the calculation of diluted net loss per common share for the periods presented:

(in thousands)
 
Three Months Ended
June 30,
  
Six Months Ended
June 30,
 
 
 
2014
  
2013
  
2014
  
2013
 
 
        
Numerator:
        
Net loss as reported
 
$
(10,623
)
 
$
(8,627
)
 
$
(22,099
)
 
$
(21,263
)
Less: income from change in fair value of warrant liability
  
(1,447
)
  
(2,494
)
  
(1,820
)
  
(2,584
)
Numerator for diluted net loss per common share
 
$
(12,070
)
 
$
(11,121
)
 
$
(23,919
)
 
$
(23,847
)
 
                
Denominator:
                
Basic weighted average common shares outstanding
  
85,061
   
49,135
   
84,766
   
46,411
 
Dilutive common shares from assumed warrant exercises
  
821
   
731
   
1,345
   
1,362
 
Diluted weighted average common shares outstanding
  
85,882
   
49,866
   
86,111
   
47,773