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17. INCOME TAXES (Details 5) - Canada - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
DisclosureOfIncomeTaxesLineItems [Line Items]    
Tax losses - gross $ 117,210 $ 107,337
Tax benefit at tax rate of 25% - 27% 31,284 28,614
Set-off against deferred tax liabilities (9,340) (8,781)
Total tax loss assets not recognized 21,944 19,833
Tax credits 897 860
Total tax credit assets not recognized $ 897 $ 860