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Other Balance Sheet Accounts (Tables)
12 Months Ended
Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Summary of Property and Equipment

Property and equipment consisted of the following at December 31 (in thousands):

 

     2014     2013  

Equipment

   $ 17,515      $ 18,027   

Leasehold improvements

     8,048        8,048   
  

 

 

   

 

 

 
     25,563        26,075   

Less accumulated depreciation and amortization

     (22,924     (22,140
  

 

 

   

 

 

 
   $ 2,639      $ 3,935   
  

 

 

   

 

 

 

 

Summary of Intangible Assets

Intangible assets consisted of the following at December 31 (in thousands):

 

     2014     2013  

Patent application costs

     2,972        3,968   

Accumulated amortization patent costs

     (1,312     (1,996
  

 

 

   

 

 

 
   $ 1,660      $ 1,972   
  

 

 

   

 

 

 

Summary of Accounts Payable and Accrued Expenses

Accounts payable and accrued expenses consisted of the following at December 31 (in thousands):

 

     2014      2013  

Employee compensation

   $ 2,471       $ 1,587   

Clinical trial accruals

     1,686         347   

Accounts payable

     227         395   

Deferred rent

     432         369   

Post-termination benefit accrual

     —           369   

Other accrued liabilities

     385         436   
  

 

 

    

 

 

 
   $ 5,201       $ 3,503