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Trade and other payables (Tables) | 12 Months Ended
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Dec. 31, 2018
Subclassifications of assets, liabilities and equities [abstract] |
Schedule of trade and other payables |
| December 31, 2018 |  |  | December 31, 2017 |
Trade accounts payable | $ | 6,924 |  |  | $ | 13,181 |
Compensation payable | 8,505 |  |  | 9,209 |
Other liabilities | 5,327 |  |  | 2,491 |
Taxes payable | 398 |  |  | 362 |
| $ | 21,154 |  |  | $ | 25,243 |

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