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PLANT AND EQUIPMENT AND MINERAL PROPERTIES - Schedule of Summary of Mineral Properties (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Property, Plant and Equipment [Line Items]          
Impairment of mineral properties held for sale $ 200,000 $ 0 $ 3,799,000 $ 0  
Mineral properties 83,539,000   83,539,000   $ 92,625,000
Abandonment of mineral properties 0 $ 1,005,000 287,000 $ 1,036,000  
Uranerz ISR properties          
Property, Plant and Equipment [Line Items]          
Mineral properties 25,974,000   25,974,000   35,060,000
In-situ recovery total          
Property, Plant and Equipment [Line Items]          
Mineral properties 25,974,000   25,974,000   35,060,000
Sheep Mountain          
Property, Plant and Equipment [Line Items]          
Mineral properties 34,183,000   34,183,000   34,183,000
Roca Honda          
Property, Plant and Equipment [Line Items]          
Mineral properties 22,095,000   22,095,000   22,095,000
Other          
Property, Plant and Equipment [Line Items]          
Mineral properties 1,287,000   1,287,000   1,287,000
Conventional total          
Property, Plant and Equipment [Line Items]          
Mineral properties $ 57,565,000   $ 57,565,000   $ 57,565,000