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Selling, general and administrative expenses (Tables)
3 Months Ended
Mar. 31, 2016
Selling, General and Administrative Expenses

Selling, general and administrative expenses consist of the following:

 

     Three months ended March 31,  
     2015      2016  

Personnel expenses

   $ 105,838       $ 108,400   

Operational expenses

     40,562         49,578   

Depreciation and amortization

     2,348         2,171   
  

 

 

    

 

 

 
   $ 148,748       $ 160,149