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17. INCOME TAXES (Details 5) - Canada - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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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

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