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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