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Prepaid expenses and other current assets
 12 Months Ended
Dec. 31, 2011
Prepaid expenses and other current assets [Abstract]  
Prepaid expenses and other current assets

7. Prepaid expenses and other current assets

Prepaid expenses and other current assets consist of the following:

 

                 
    As of December 31,  
    2010     2011  

Prepaid rent

   $ 5,651     $ 5,001  

Other prepaid expenses

     82       8  

Rental deposits and other receivables

     2,607       4,453  
   

 

 

    

 

 

  

Total prepaid expenses and other current assets

   $ 8,340     $ 9,462  
   

 

 

    

 

 

  

 

Bad debt expense was $1,006 and $832 for the year ended December 31, 2010 and 2011.