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INCOME TAXES - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Components of Deferred Tax Assets [Abstract] |  |
Inventories | $ 547 | $ 5,984
Short-term investments | 209 | 209
Operating loss carry forwards | 93,241 | 108,827
Capital loss carry forwards | 849 | 881
Deferred revenue and other | 2,431 | 5,433
Mineral properties and deferred costs, United States | 16,872 | 18,727
Mineral properties and deferred costs, Canada | 1,726 | 1,815
Asset retirement obligations | 2,894 | 3,976
Property, plant and equipment | 986 | 1,079
Total deferred tax assets | 119,755 | 146,931
Less: valuation allowance | (119,755) | (146,931)
Net deferred tax assets | $ 0 | $ 0

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