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Selling, general and administrative expenses | 12 Months Ended
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Dec. 31, 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 years ended December 31, 2019, 2018 and 2017:
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
Personnel expenses | $ | 122,453 |  |  | $ | 132,694 |  |  | $ | 156,726 |
Share-based compensation | 69,410 |  |  | 95,176 |  |  | 107,719 |
Professional services | 24,287 |  |  | 24,264 |  |  | 28,585 |
Travel expenses | 17,604 |  |  | 21,790 |  |  | 19,774 |
Office expenses | 14,095 |  |  | 14,784 |  |  | 16,105 |
Directors’ expenses | 3,042 |  |  | 3,169 |  |  | 3,345 |
Other expenses | 16,567 |  |  | 13,349 |  |  | 16,037 |
| $ | 267,458 |  |  | $ | 305,226 |  |  | $ | 348,291 |

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