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Property and Equipment
12 Months Ended
Dec. 31, 2012
Property and Equipment  
Property and Equipment

6. Property and Equipment

Property and equipment consist of the following, in thousands:

 
  December 31,  
 
  2011   2012  

Computer equipment

  $ 586   $ 615  

Software

    209     209  

Lab equipment and furniture

    3,465     3,896  

Leasehold improvements

    1,486     1,779  
           

 

    5,746     6,499  

Less accumulated depreciation and amortization

    (4,436 )   (5,078 )
           

 

  $ 1,310   $ 1,421  
           

Depreciation expense on property and equipment for the years ended December 31, 2010, 2011 and 2012 was approximately $959,000, $650,000, and $642,000, respectively.