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Selling, general and administrative expenses (Tables)
12 Months Ended
Dec. 31, 2017
Selling, General and Administrative Expense [Abstract]  
Schedule of selling, general and administrative expenses
Selling, general and administrative expenses consisted of the following for the years ended December 31, 2017, 2016 and 2015:
 
Year Ended December 31,
 
2017
 
2016
 
2015
Personnel expenses
$
156,726

 
$
149,505

 
$
161,967

Share-based compensation
107,719

 
102,843

 
100,162

Travel expenses
19,774

 
21,201

 
23,090

Professional services
28,585

 
30,983

 
42,921

Office expenses
16,105

 
20,703

 
26,989

Directors’ expenses
3,345

 
3,051

 
2,780

Other expenses
16,037

 
22,726

 
23,399

 
$
348,291

 
$
351,012

 
$
381,308