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REPORTABLE SEGMENTS - Schedule of Segment Reporting Information by Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Segment Reporting Information [Line Items] |  |  |  |
Revenues (Note 17) | $ 25,108 | $ 4,212 | $ 60,946 | $ 21,110
Costs applicable to revenues | 10,690 | 3,655 | 32,165 | 21,779
Exploration, development and processing (excluding share-based compensation) | 8,115 | 9,075 | 16,209 | 15,521
Standby | 2,872 | 1,780 | 6,208 | 3,647
Accretion of asset retirement obligations | 3,711 | 862 | 4,308 | 1,935
Selling, general and administrative | 15,922 | 12,130 | 29,292 | 25,106
Share-based compensation | 3,641 | 2,885 | 7,152 | 5,490
Transaction and integration related costs | 10,732 | 0 | 13,115 | 0
Total operating costs and expenses | 55,683 | 30,387 | 108,449 | 73,478
Operating loss | (30,575) | (26,175) | (47,503) | (52,368)
Depletion, depreciation and amortization |  |  | 3,095 | 2,611
Operating Segments | Uranium Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues (Note 17) | 25,108 | 3,934 | 60,946 | 5,289
Costs applicable to revenues | 10,690 | 2,659 | 32,165 | 2,659
Exploration, development and processing (excluding share-based compensation) | 6,238 | 4,729 | 12,528 | 9,925
Standby | 2,872 | 1,780 | 6,208 | 3,647
Accretion of asset retirement obligations | 391 | 356 | 771 | 702
Selling, general and administrative | 3,487 | 2,534 | 6,202 | 7,193
Share-based compensation | 1,159 | 520 | 2,354 | 1,408
Transaction and integration related costs | 0 |  | 0 |
Total operating costs and expenses | 24,837 | 12,578 | 60,228 | 25,534
Operating loss | 271 | (8,644) | 718 | (20,245)
Depletion, depreciation and amortization | 790 | 790 | 1,550 | 1,410
Operating Segments | Heavy Mineral Sands Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues (Note 17) | 0 | 278 | 0 | 15,821
Costs applicable to revenues | 0 | 996 | 0 | 19,120
Exploration, development and processing (excluding share-based compensation) | 1,333 | 3,329 | 2,597 | 4,579
Standby | 0 | 0 | 0 | 0
Accretion of asset retirement obligations | 3,320 | 506 | 3,537 | 1,233
Selling, general and administrative | 7,698 | 6,535 | 14,399 | 11,741
Share-based compensation | 1,225 | 1,801 | 2,166 | 3,015
Transaction and integration related costs | 0 |  | 0 |
Total operating costs and expenses | 13,576 | 13,167 | 22,699 | 39,688
Operating loss | (13,576) | (12,889) | (22,699) | (23,867)
Depletion, depreciation and amortization | 110 | 50 | 190 | 100
Operating Segments | Rare Earth Elements Segment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues (Note 17) | 0 | 0 | 0 | 0
Costs applicable to revenues | 0 | 0 | 0 | 0
Exploration, development and processing (excluding share-based compensation) | 544 | 1,017 | 1,084 | 1,017
Standby | 0 | 0 | 0 | 0
Accretion of asset retirement obligations | 0 | 0 | 0 | 0
Selling, general and administrative | 4,737 | 3,061 | 8,691 | 6,172
Share-based compensation | 1,257 | 564 | 2,632 | 1,067
Transaction and integration related costs | 0 |  | 0 |
Total operating costs and expenses | 6,538 | 4,642 | 12,407 | 8,256
Operating loss | (6,538) | (4,642) | (12,407) | (8,256)
Depletion, depreciation and amortization | 770 | $ 590 | 1,360 | $ 1,100
Segment Reporting, Reconciling Item, Corporate Nonsegment |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues (Note 17) | 0 |  | 0 |
Costs applicable to revenues | 0 |  | 0 |
Exploration, development and processing (excluding share-based compensation) | 0 |  | 0 |
Standby | 0 |  | 0 |
Accretion of asset retirement obligations | 0 |  | 0 |
Selling, general and administrative | 0 |  | 0 |
Share-based compensation | 0 |  | 0 |
Transaction and integration related costs | 10,732 |  | 13,115 |
Total operating costs and expenses | 10,732 |  | 13,115 |
Operating loss | $ (10,732) |  | $ (13,115) |

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