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Property and Equipment (Tables)
 12 Months Ended
Dec. 31, 2013
Property and Equipment  
Schedule of property and equipment
  December 31,  
(In thousands)
  2013   2012  

Computer equipment

   $ 3,084   $ 3,027  

Software

     5,391     5,073  

Furniture and fixtures

     3,890     3,829  

Laboratory equipment

     31,910     29,229  

Leasehold improvements

     17,769     17,416  
           
​ ​ ​ ​ ​ ​ ​ ​

 

     62,044     58,574  

Less accumulated depreciation and amortization

     (51,806 )   (49,420 )
           
​ ​ ​ ​ ​ ​ ​ ​

Property and equipment, net

   $ 10,238   $ 9,154  
           
​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​