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9. INVESTMENTS (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Current investments | $ 30,136 | $ 0 |
Noncurrent investments | 5,866 | 3,760 |
Total investments | 36,002 | 3,760 | $ 7,778
Equity instruments-fair value through profit and loss |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Total investments | 5,846 | 3,745 |
Equity instruments-available for sale |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Total investments | 20 | 15 |
Debt instruments-fair value through profit and loss |  |  |
DisclosureOfInvestmentsLineItems [Line Items] |  |  |
Total investments | $ 30,136 | $ 0 |

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