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Property, Equipment and Software
12 Months Ended
Dec. 31, 2011
Property, Equipment and Software [Abstract]  
Property, Equipment and Software
6. Property, Equipment and Software

Property, equipment and software consisted of the following (in thousands):

 

                 
    December 31,  
    2010     2011  

Purchased software, computer and office equipment

  $ 7,166     $ 8,260  

Office furniture

    1,188       1,701  

Leasehold improvements

    1,803       10,660  

Equipment under capital lease obligations

    655       804  

Capitalized software development costs

    1,536       1,785  

Information database costs

    2,565       2,641  
   

 

 

   

 

 

 
      14,913       25,851  

Less accumulated depreciation and amortization

    (8,730 )      (8,008 ) 
   

 

 

   

 

 

 

Property, equipment and software, net

  $ 6,183     $ 17,843  
   

 

 

   

 

 

 

Depreciation and amortization expense, including depreciation on equipment under capital leases, was $1,658,000, $1,971,000 and $2,655,000 for the years ended December 31, 2009, 2010 and 2011 respectively.