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16. OTHER LIABILITIES (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
DisclosureOfOtherLiabilitiesLineItems [Line Items]    
Current other liabilities $ 3,057 $ 2,123
Noncurrent other liabilities 0 630
Total other liabilities 3,057 2,753
Debt obligations    
DisclosureOfOtherLiabilitiesLineItems [Line Items]    
Total other liabilities 0 276
Unamortized fair value of toll milling contracts    
DisclosureOfOtherLiabilitiesLineItems [Line Items]    
Total other liabilities 0 674
Flow-through share premium obligation    
DisclosureOfOtherLiabilitiesLineItems [Line Items]    
Total other liabilities $ 3,057 $ 1,803