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Common Stock Warrant Liability (Tables)
 12 Months Ended
Dec. 31, 2013
Common Stock Warrant Liability [Abstract]  
Estimated fair value of warrants accounted for derivative liabilities
Selected terms and estimated fair value of warrants accounted for as derivative are as follows:

 
  
 
   
 
Fair Value of Warrants
(in thousands)
Issuance
Date
 
Number of Warrant Shares Issuable
  
Exercise
Price
 
Warrant
Expiration
Date
 
Value at
Issuance
Date
  
December 31,
 
2013
  
2012
 
 
 
  
 
 
 
  
  
 
5/13/2009
  
466,667
  
$
17.25
 
5/13/2014
 
$
3,360
  
$
–
  
$
–
 
2/23/2010
  
916,669
   
12.75
 
2/23/2015
  
5,701
   
6
   
104
 
2/22/2011
  
4,834,950
   
1.50
 
2/22/2016
  
8,004
   
5,419
   
6,201
 
 
        
 
     
$
5,425
  
$
6,305