SALE OF URANIUM ASSETS - Gain on disposal of uranium assets (Details) - Uranium assets $ in Thousands	12 Months Ended
	Dec. 31, 2019 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)
Gain on disposal of uranium assets	$ 729