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COMMITMENTS AND CONTINGENCIES - Obligations Under Operating Leases (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Jun. 30, 2019
Aug. 19, 2010
Operating lease obligations      
Total expected payments for operating lease for the next three years $ 100    
Lease term 3 years    
Expected payments for operating lease, current fiscal year $ 100    
Expected payments for operating lease, 12 to 24 months 0    
Expected payments for operating lease, 24 to 36 months 0    
Eureka Moly LLC      
Operating lease obligations      
Sustainability Trust fund asset amount     $ 5,600
Paid into trust   $ 100  
Accrual for trust to be established upon certain achievements of milestones $ 5,500    
Eureka Moly LLC | Mt. Hope Project      
Operating lease obligations      
Lease term 30 years