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COMMITMENTS AND CONTINGENCIES - Short-term Bank Indebtedness (Details)
$ in Thousands
Nov. 30, 2017
MXN ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Nov. 30, 2017
USD ($)
Short-term Bank Indebtedness        
Short-term Debt   $ 0 $ 0  
Line of Credit. | Secured Debt        
Short-term Bank Indebtedness        
Amount withdrawn from line of credit   $ 0    
Line of Credit. | Secured Debt | Compania Minera Pangea, S.A. de C.V. (“CMP”)        
Short-term Bank Indebtedness        
Maximum borrowing capacity $ 120,000,000     $ 6,400
Market exchange rate 19.64     19.64
Line of Credit availability 1 year