SALE OF URANIUM ASSETS - Disposal of Uranium Assets (Details) $ in Thousands	Aug. 30, 2019 USD ($)	Mar. 05, 2019 USD ($) item
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Royalty interests sold | item		4
Asset Purchase Agreement with URC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Exchange for final payment	$ 1,250
Uranium assets | Asset Purchase Agreement with URC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Borrowings		$ 2,000
Total cash consideration of disposal		2,750
Paid at signing		$ 500
Cash proceed	$ 1,000