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Common Stock Warrant Liability (Tables)
 12 Months Ended
Dec. 31, 2014
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,
 
2014
  
2013
 
            
2/23/2010
  
916,669
   
12.75
 
2/23/2015
 
$
5,701
  
$
–
  
$
6
 
2/22/2011
  
4,550,100
   
1.50
 
2/22/2016
  
8,004
   
1,258
   
5,419
 
               
$
1,258
  
$
5,425