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PLANT AND EQUIPMENT AND MINERAL PROPERTIES - Schedule of Summary of Mineral Properties (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Property, Plant and Equipment [Line Items]          
Mineral properties $ 83,539   $ 83,539   $ 83,539
Abandonment of mineral properties 0 $ 42 0 $ 287  
Uranerz ISR properties          
Property, Plant and Equipment [Line Items]          
Mineral properties 25,974   25,974   25,974
Sheep Mountain          
Property, Plant and Equipment [Line Items]          
Mineral properties 34,183   34,183   34,183
Roca Honda          
Property, Plant and Equipment [Line Items]          
Mineral properties 22,095   22,095   22,095
Other          
Property, Plant and Equipment [Line Items]          
Mineral properties $ 1,287   $ 1,287   $ 1,287