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SEGMENT INFORMATION - Schedule of Segment Reporting Information, by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Segment Reporting Information [Line Items]      
Revenue $ 3,756 $ 17,996  
Costs and expenses applicable to revenue 2,071 12,143  
Impairment of inventories 0    
Development, permitting and land holding 3,323 7,442  
Standby costs 1,206 2,166  
Abandonment of mineral properties 245 0  
Accretion of asset retirement obligation 345 175 $ 906
Selling costs 70 74  
Intangible asset amortization 205 219  
General and administration 4,428 3,828  
Total operating loss (8,137) (8,377)  
Interest expense (542) (576)  
Other expense (1,917) 88  
Net loss (10,596) (8,865)  
Owners of the Company (10,508) (8,808)  
Non-controlling interests (88) $ (57)  
Operating Segments | Conventional      
Segment Reporting Information [Line Items]      
Revenue 3,756    
Costs and expenses applicable to revenue 2,071    
Impairment of inventories 0    
Development, permitting and land holding 2,912    
Standby costs 429    
Abandonment of mineral properties 0    
Accretion of asset retirement obligation 170    
Selling costs 70    
Intangible asset amortization 205    
General and administration 775    
Total operating loss (2,876)    
Interest expense 0    
Other expense 0    
Net loss (2,876)    
Owners of the Company (2,876)    
Non-controlling interests 0    
Operating Segments | ISR      
Segment Reporting Information [Line Items]      
Revenue 0    
Costs and expenses applicable to revenue 0    
Impairment of inventories 0    
Development, permitting and land holding 411    
Standby costs 777    
Abandonment of mineral properties 245    
Accretion of asset retirement obligation 175    
Selling costs 0    
Intangible asset amortization 0    
General and administration 228    
Total operating loss (1,836)    
Interest expense 0    
Other expense 0    
Net loss (1,836)    
Owners of the Company (1,748)    
Non-controlling interests (88)    
Corporate & Other      
Segment Reporting Information [Line Items]      
Revenue 0    
Costs and expenses applicable to revenue 0    
Impairment of inventories 0    
Development, permitting and land holding 0    
Standby costs 0    
Abandonment of mineral properties 0    
Accretion of asset retirement obligation 0    
Selling costs 0    
Intangible asset amortization 0    
General and administration 3,425    
Total operating loss (3,425)    
Interest expense (542)    
Other expense (1,917)    
Net loss (5,884)    
Owners of the Company (5,884)    
Non-controlling interests $ 0