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Cost of revenue
3 Months Ended
Mar. 31, 2016
Cost of revenue

18. Cost of revenue

Cost of revenue consists of the following:

 

     Three months ended March 31,  
     2015      2016  

Personnel expenses

   $ 242,948       $ 254,028   

Operational expenses

     102,797         107,542   

Depreciation and amortization

     11,731         11,278   
  

 

 

    

 

 

 
   $ 357,476       $ 372,848