Property and Equipment - Net (Tables)
9 Months Ended
Sep. 30, 2012
Property and Equipment - Net [Abstract]  
Schedule of property and equipment
                 
    December 31,
2011
    September 30,
2012
 

Computer equipment (1)

  $ 13,032     $ 16,640  

Computer software

    1,409       2,748  

Furniture and fixtures

    1,049       1,050  

Leasehold improvements

    690       718  

Work in process

    —         1,249  

Other

    933       173  
   

 

 

   

 

 

 
      17,113       22,578  

Less accumulated depreciation (2)

    (8,812     (11,400
   

 

 

   

 

 

 

Total property and equipment—net

  $ 8,301     $ 11,178  
   

 

 

   

 

 

 

Notes:

(1) Includes equipment under capital lease obligations of approximately $3,442 and $5,882 as of December 31, 2011 and September 30, 2012, respectively.
(2) Includes $687 and $1,519 of accumulated depreciation of equipment under capital leases as of December 31, 2011 and September 30, 2012, respectively.