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Fixed assets
12 Months Ended
Dec. 31, 2013
Fixed assets  
Fixed assets

4. Fixed assets

        Fixed assets, net were as follows at December 31, 2013 and 2012:

 
  December 31,  
 
  2013   2012  

Leasehold improvements

  $ 12,473,836   $ 12,473,836  

Computer equipment and software

    2,284,836     2,118,713  

Furniture, fixtures, and lab equipment

    14,283,875     13,969,758  

Assets not yet placed in service

    369,644     4,152  
           

 

    29,412,191     28,566,459  

Less accumulated depreciation and amortization

    (22,682,827 )   (20,286,422 )
           

 

  $ 6,729,364   $ 8,280,037  
           
           

        Depreciation expense was approximately $2.4 million, $2.7 million, and $2.9 million for the years ended December 31, 2013, 2012 and 2011, respectively.