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Selling, general and administrative expenses (Tables) | 12 Months Ended
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Dec. 31, 2021
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, 2021, 2020 and 2019:
| Year Ended December 31,
| 2021 |  | 2020 |  | 2019
Personnel expenses | $ | 150,286 |  |  | $ | 104,765 |  |  | $ | 122,453 |
Share-based compensation | 96,087 |  | (a) | 69,187 |  |  | 69,410 |
Professional services | 28,999 |  |  | 24,480 |  |  | 24,287 |
Office expenses | 15,417 |  |  | 12,974 |  |  | 14,095 |
Travel expenses | 5,649 |  |  | 7,809 |  |  | 17,604 |
Other expenses | 21,450 |  |  | 22,946 |  |  | 19,609 |
| $ | 317,888 |  |  | $ | 242,161 |  |  | $ | 267,458 |
(a)Share-based compensation expense is gross of a $10.5 million tax benefit.

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