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PROPERTY, PLANT AND EQUIPMENT - Net Book Value of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Total Property, Plant and Equipment $ 15,203 $ 20,337
Net property, plant and equipment 8,996 8,995
Impairment expenses related to uranium assets 5,200  
Uranium And Lithium Operations    
Property, Plant and Equipment included in assets held for sale 6,207 11,342
Discontinued operations.    
Impairment expenses related to uranium assets 5,200  
Texas    
Total Property, Plant and Equipment 2,307 3,536
Texas | Uranium And Lithium Operations    
Property, Plant and Equipment included in assets held for sale 2,307 3,536
Alabama    
Total Property, Plant and Equipment 8,972 8,972
Net property, plant and equipment 8,972 8,972
New Mexico    
Total Property, Plant and Equipment 3,900 7,806
New Mexico | Uranium And Lithium Operations    
Property, Plant and Equipment included in assets held for sale 3,900 7,806
Corporate    
Total Property, Plant and Equipment 24 23
Net property, plant and equipment 24 23
Texas and New Mexico    
Impairment expenses related to uranium assets 5,200  
Uranium plant    
Total Property, Plant and Equipment 1,855 3,112
Uranium plant | Texas    
Total Property, Plant and Equipment 1,855 3,112
Uranium plant | Alabama    
Total Property, Plant and Equipment 0  
Mineral rights and properties    
Total Property, Plant and Equipment 12,872 16,778
Mineral rights and properties | Alabama    
Total Property, Plant and Equipment 8,972 8,972
Mineral rights and properties | New Mexico    
Total Property, Plant and Equipment 3,900 7,806
Other property, plant and equipment    
Total Property, Plant and Equipment 476 447
Other property, plant and equipment | Texas    
Total Property, Plant and Equipment 452 424
Other property, plant and equipment | Corporate    
Total Property, Plant and Equipment $ 24 $ 23