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Selling, general and administrative expenses (Tables)

12 Months Ended

Dec. 31, 2020

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, 2020, 2019 and 2018:

			Year Ended December 31,
			2020						2019						2018
Personnel expenses			$	104,765					$	122,453					$	132,694
Share-based compensation			69,187						69,410						95,176
Professional services			24,480						24,287						24,264
Travel expenses			7,809						17,604						21,790
Office expenses			12,974						14,095						14,784
Other expenses			22,946						19,609						16,518
			$	242,161					$	267,458					$	305,226

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Tabular disclosure of selling, general and administrative expenses.

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