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Selling, general and administrative expenses (Tables)
3 Months Ended
Mar. 31, 2020
Selling General And Administrative Expenses [Abstract]  
Schedule of Selling, General and Administrative Expenses

 

Selling, general and administrative expenses consist of the following:

 

 

 

Three months ended March 31,

 

 

 

2019

 

 

2020

 

Personnel expenses

 

$

142,480

 

 

$

149,628

 

Operational expenses

 

 

46,210

 

 

 

44,747

 

Depreciation and amortization

 

 

2,712

 

 

 

2,967

 

 

 

$

191,402

 

 

$

197,342