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Selling, general and administrative expenses | 6 Months Ended
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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, |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
Personnel expenses | $ | 22,461 |  |  | $ | 28,299 |  |  | $ | 49,382 |  |  | $ | 59,491 |
Share-based compensation | 14,752 |  |  | 18,615 |  |  | 32,509 |  |  | 36,028 |
Travel expenses | 1,487 |  |  | 4,605 |  |  | 5,280 |  |  | 8,859 |
Professional services | 5,814 |  |  | 5,115 |  |  | 11,503 |  |  | 11,339 |
Office expenses | 3,082 |  |  | 3,296 |  |  | 6,482 |  |  | 6,795 |
Other expenses | 5,317 |  |  | 4,613 |  |  | 12,341 |  |  | 8,904 |
| $ | 52,913 |  |  | $ | 64,543 |  |  | $ | 117,497 |  |  | $ | 131,416 |

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- References No definition available. + Details
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