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PROPERTY, PLANT AND EQUIPMENT AND MINERAL PROPERTIES - Schedule of Summary of Mineral Properties (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
Mineral properties $ 83,539 $ 83,539
Uranerz ISR properties    
Property, Plant and Equipment [Line Items]    
Mineral properties 25,974 25,974
Sheep Mountain    
Property, Plant and Equipment [Line Items]    
Mineral properties 34,183 34,183
Roca Honda    
Property, Plant and Equipment [Line Items]    
Mineral properties 22,095 22,095
Other    
Property, Plant and Equipment [Line Items]    
Mineral properties $ 1,287 $ 1,287