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Selling, general and administrative expenses
6 Months Ended
Jun. 30, 2020
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, 2020 and 2019:
Three Months Ended June 30,Six Months Ended June 30,
2020201920202019
Personnel expenses$22,461  $28,299  $49,382  $59,491  
Share-based compensation14,752  18,615  32,509  36,028  
Travel expenses1,487  4,605  5,280  8,859  
Professional services5,814  5,115  11,503  11,339  
Office expenses3,082  3,296  6,482  6,795  
Other expenses5,317  4,613  12,341  8,904  
$52,913  $64,543  $117,497  $131,416