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Property and Equipment (Tables)
9 Months Ended
Sep. 30, 2012
Property and Equipment [Abstract]  
Property and Equipment
                 
    At December 31,
2011
    At September 30,
2012
 

Computer and other related equipment

  $ 13,671     $ 15,321  

Purchased and internally developed software

    6,667       7,373  

Furniture and fixtures

    1,229       1,232  

Leasehold improvements

    1,805       1,809  
   

 

 

   

 

 

 
    $ 23,372     $ 25,735  

Less: accumulated depreciation and amortization

    (17,185     (19,531
   

 

 

   

 

 

 

Property and equipment, net

  $ 6,187     $ 6,204