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SEGMENT INFORMATION - Schedule of Segment Reporting Information, by Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Segment Reporting Information [Line Items] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 78,114 | $ 37,928 | $ 12,515
Costs and expenses applicable to revenue | 55,918 | 18,181 | 7,844
Development, Permitting And Land Holding | 14,179 | 15,531 | 9,346
Standby Costs | 6,520 | 7,476 | 13,221
Accretion of asset retirement obligations | 2,068 | 1,192 | 1,556
Selling, general and administration | 31,187 | 23,290 | 20,845
Allocated Share-based Compensation Expense | 5,414 | 4,625 | 4,641
Business Combination, Acquisition Related Costs | 10,343 | 0 | 0
Costs and Expenses | 125,629 | 70,295 | 57,453
Operating Income (Loss), Total | (47,515) | (32,367) | (44,938)
Investment in unconsolidated affiliate | 12,921 | 0 |
Assets, Total | 611,969 | 401,939 |
Depreciation, Depletion and Amortization | 3,127 | 2,751 | 3,269
Operating Segments | Uranium |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 38,240 | 35,080 | 10,393
Costs and expenses applicable to revenue | 16,580 | 15,869 | 3,769
Development, Permitting And Land Holding | 7,232 | 5,584 | 6,543
Standby Costs | 6,520 | 7,476 | 13,221
Accretion of asset retirement obligations | 1,253 | 1,192 | 1,556
Selling, general and administration | 12,733 | 12,899 | 11,966
Allocated Share-based Compensation Expense | 2,660 | 2,562 | 2,664
Business Combination, Acquisition Related Costs | 0 |  |
Costs and Expenses | 46,978 | 45,582 | 39,719
Operating Income (Loss), Total | (8,738) | (10,502) | (29,326)
Depreciation, Depletion and Amortization | 1,070 | 1,950 | 3,270
Operating Segments | Heavy Mineral Sands |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 39,874 | 0 | 0
Costs and expenses applicable to revenue | 39,338 | 0 | 0
Development, Permitting And Land Holding | 2,628 | 583 | 0
Standby Costs | 0 | 0 | 0
Accretion of asset retirement obligations | 815 | 0 | 0
Selling, general and administration | 10,995 | 2,590 | 540
Allocated Share-based Compensation Expense | 1,196 | 514 | 120
Business Combination, Acquisition Related Costs | 0 |  |
Costs and Expenses | 54,972 | 3,687 | 660
Operating Income (Loss), Total | (15,098) | (3,687) | (660)
Depreciation, Depletion and Amortization | 1,850 | 580 | 0
Operating Segments | Rare Earth Elements |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 2,848 | 2,122
Costs and expenses applicable to revenue | 0 | 2,312 | 4,075
Development, Permitting And Land Holding | 4,319 | 9,364 | 2,803
Standby Costs | 0 | 0 | 0
Accretion of asset retirement obligations | 0 | 0 | 0
Selling, general and administration | 7,459 | 7,801 | 8,339
Allocated Share-based Compensation Expense | 1,558 | 1,549 | 1,857
Business Combination, Acquisition Related Costs | 0 |  |
Costs and Expenses | 13,336 | 21,026 | 17,074
Operating Income (Loss), Total | (13,336) | (18,178) | (14,952)
Depreciation, Depletion and Amortization | 210 | 220 | 0
Corporate & Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 0 | 0 | 0
Costs and expenses applicable to revenue | 0 | 0 | 0
Development, Permitting And Land Holding | 0 | 0 | 0
Standby Costs | 0 | 0 | 0
Accretion of asset retirement obligations | 0 | 0 | 0
Selling, general and administration | 0 | 0 | 0
Allocated Share-based Compensation Expense | 0 | 0 | 0
Business Combination, Acquisition Related Costs | 10,343 |  |
Costs and Expenses | 10,343 | 0 | 0
Operating Income (Loss), Total | $ (10,343) | $ 0 | $ 0

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