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Selling, general and administrative expenses | 12 Months Ended
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Dec. 31, 2017
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, 2017, 2016 and 2015:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Personnel expenses | $ | 156,726 |  |  | $ | 149,505 |  |  | $ | 161,967 |
Share-based compensation | 107,719 |  |  | 102,843 |  |  | 100,162 |
Travel expenses | 19,774 |  |  | 21,201 |  |  | 23,090 |
Professional services | 28,585 |  |  | 30,983 |  |  | 42,921 |
Office expenses | 16,105 |  |  | 20,703 |  |  | 26,989 |
Directors’ expenses | 3,345 |  |  | 3,051 |  |  | 2,780 |
Other expenses | 16,037 |  |  | 22,726 |  |  | 23,399 |
| $ | 348,291 |  |  | $ | 351,012 |  |  | $ | 381,308 |

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