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Property and Equipment (Tables)
12 Months Ended
Dec. 31, 2012
Property and Equipment [Abstract]  
Summary of property and equipment

Property and equipment consist of the following (in thousands):

 

                 
    December 31,  
    2012     2011  

Laboratory equipment

  $ 2,950     $ 2,851  

Furniture and fixtures

    499       442  

Leasehold improvements

    1,046       1,036  
   

 

 

   

 

 

 
      4,495       4,329  

Less accumulated depreciation

    (2,952     (2,726
   

 

 

   

 

 

 
    $ 1,543     $ 1,603