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13. DEFERRED REVENUE (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
DisclosureOfDeferredRevenueLineItems [Line Items]    
Current deferred revenue $ 2,498 $ 0
Noncurrent deferred revenue 27,181 0
Total deferred revenue 29,679 0
Toll Milling    
DisclosureOfDeferredRevenueLineItems [Line Items]    
Total deferred revenue $ 29,679 $ 0