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Fixed Assets
9 Months Ended
Sep. 30, 2013
Fixed Assets
6. FIXED ASSETS

Fixed assets consist of the following (in thousands):
 
       
   
September 30,
2013
 
December 31,
2012
       
Laboratory equipment
  $ 7,673     $ 7,628  
Furniture and office equipment
    1,619       1,619  
Software and computers
    5,357       4,763  
Leasehold improvements
    4,510       4,502  
Construction in process
          197  
Total
    19,159       18,709  
Less: accumulated depreciation
    (14,020 )     (13,380 )
    $ 5,139     $ 5,329  
 
Depreciation expense for the three and nine months ended September 30, 2013 was approximately $224,000 and $641,000, respectively and $246,000 and $824,000 for the three and nine months ended September 30, 2012, respectively.