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Selling, general and administrative expenses
 6 Months Ended
Jun. 30, 2019
Selling, General and Administrative Expense [Abstract]  
Selling, general and administrative expenses Selling, general and administrative expenses
Selling, general and administrative expenses consisted of the following for the three and six months ended June 30, 2019 and 2018:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2019
 
2018
 
2019
 
2018
Personnel expenses
$
28,299

 
$
37,430

 
$
59,491

 
$
70,062

Share-based compensation
18,615

 
30,287

 
36,028

 
62,021

Travel expenses
4,605

 
5,311

 
8,859

 
10,762

Professional services
5,115

 
6,149

 
11,339

 
13,219

Office expenses
3,296

 
3,673

 
6,795

 
7,802

Directors’ expenses
822

 
958

 
1,557

 
1,665

Other expenses
3,791

 
1,464

 
7,347

 
5,523

 
$
64,543

 
$
85,272

 
$
131,416

 
$
171,054