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INCOME TAXES - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Deferred Tax Assets, Net [Abstract] |  |
Asset retirement and environmental obligations | $ 5,643 | $ 8,744
Net operating losses | 0 | 2,174
Inventories | 12,448 | 6,695
Offtake Advances, net of debt discount | 0 | 4,034
Shenghe Warrant | 0 | 2,329
Research and experimental costs | 691 | 0
Stock-based compensation | 3,785 | 2,688
Organization costs | 776 | 860
Credits | 346 | 764
Other | 351 | 636
Gross deferred tax assets | 24,040 | 28,924
Less: Valuation allowance | (346) | (3,192)
Net deferred tax assets | 23,694 | 25,732
Deferred Tax Liabilities, Net [Abstract] |  |
Property, plant and equipment | (36,481) | (14,077)
Prepaid expenses | (1,567) | (1,192)
Deferred revenue | (6,604) | (9,938)
Mineral rights | (101,195) | (104,735)
Other | (200) | (290)
Total deferred tax liabilities | (146,047) | (130,232)
Non-current deferred tax liabilities, net | $ (122,353) | $ (104,500)

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