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INCOME TAXES - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets
Inventories	$ 5,984	$ 6,380
Short-term investments	209	209
Operating loss carry forwards	108,827	101,345
Capital loss carry forwards	881	914
Deferred revenue and other	5,433	1,520
Mineral properties and deferred costs, United States	18,727	18,682
Mineral properties and deferred costs, Canada	1,815	1,884
Asset retirement obligations	3,976	3,627
Property, plant and equipment	1,079	942
Total deferred tax assets	146,931	135,503
Less: valuation allowance	(146,931)	(135,503)
Net deferred tax assets	$ 0	$ 0

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