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14. POST-EMPLOYMENT BENEFITS (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
DisclosureOfPostEmploymentBenefitLiabilityLineItems [Line Items] |  |  |
Current post-employment benefits | $ 199 | $ 186 |
Noncurrent post-employment benefits | 1,687 | 1,646 |
Total post-employment benefits | 1,886 | 1,832 | $ 2,389
Accrued benefit obligation |  |  |
DisclosureOfPostEmploymentBenefitLiabilityLineItems [Line Items] |  |  |
Total post-employment benefits | $ 1,886 | $ 1,832 |

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