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Selling, general and administrative expenses | 6 Months Ended
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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 |

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