ACQUISITIONS AND DISPOSALS - Gain on Disposal of Uranium Assets (Details) - Uranium assets $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total cash consideration received, net of transaction costs	$ 2,470
Carrying value of promissory note	(1,741)
Loss on disposal of Uranium Entities	$ 729