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INCOME TAXES - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets
Inventories	$ 6,380	$ 7,051
Short-term investments	209	209
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent Classification [Abstract]
Operating loss carry forwards	101,345	95,060
Capital loss carry forwards	914	843
Deferred revenue and other	1,520	2,057
Mineral properties and deferred costs, United States	18,682	24,794
Mineral properties and deferred costs, Canada	1,884	1,760
Asset retirement obligations	3,627	3,455
Property, plant and equipment	942	1,806
Total deferred tax assets	135,503	137,035
Less: valuation allowance	(135,503)	(137,035)
Net deferred tax assets	$ 0	$ 0

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