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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