v3.26.3
REPORTABLE SEGMENTS - Schedule of Segment Reporting Information by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Segment Reporting Information [Line Items]        
Revenues (Note 18) $ 29,180 $ 17,710 $ 90,126 $ 38,820
Costs applicable to revenues 11,304 12,784 43,469 34,563
Exploration, development and processing (excluding share-based compensation) 11,807 12,446 28,016 27,967
Standby 3,088 2,525 9,296 6,172
Accretion of asset retirement obligations 579 687 4,887 2,622
Selling, general and administrative 15,125 12,634 44,417 37,740
Share-based compensation 3,560 3,300 10,712 8,790
Transactions and integration related costs 9,030 0 22,145 0
Total operating costs and expenses 54,493 44,376 162,942 117,854
Operating loss (25,313) (26,666) (72,816) (79,034)
Depletion, depreciation and amortization     5,285 4,001
Operating Segments | Uranium Segment        
Segment Reporting Information [Line Items]        
Revenues (Note 18) 28,744 17,710 89,690 22,999
Costs applicable to revenues 10,893 12,784 43,058 15,443
Exploration, development and processing (excluding share-based compensation) 7,837 7,406 20,365 17,331
Standby 3,088 2,525 9,296 6,172
Accretion of asset retirement obligations 402 364 1,173 1,066
Selling, general and administrative 2,755 2,591 8,957 9,785
Share-based compensation 969 800 3,323 2,207
Transactions and integration related costs 0   0  
Total operating costs and expenses 25,944 26,470 86,172 52,004
Operating loss 2,800 (8,760) 3,518 (29,005)
Depletion, depreciation and amortization 1,170 720 2,720 2,130
Operating Segments | Heavy Mineral Sands Segment        
Segment Reporting Information [Line Items]        
Revenues (Note 18) 0 0 0 15,821
Costs applicable to revenues 0 0 0 19,120
Exploration, development and processing (excluding share-based compensation) 1,984 4,160 4,581 8,739
Standby 0 0 0 0
Accretion of asset retirement obligations 171 323 3,708 1,556
Selling, general and administrative 7,630 6,710 22,029 18,451
Share-based compensation 1,264 1,677 3,430 4,692
Transactions and integration related costs 0   0  
Total operating costs and expenses 11,049 12,870 33,748 52,558
Operating loss (11,049) (12,870) (33,748) (36,737)
Depletion, depreciation and amortization 120 50 310 150
Operating Segments | Rare Earth Elements Segment        
Segment Reporting Information [Line Items]        
Revenues (Note 18) 436 0 436 0
Costs applicable to revenues 411 0 411 0
Exploration, development and processing (excluding share-based compensation) 1,986 880 3,070 1,897
Standby 0 0 0 0
Accretion of asset retirement obligations 6 0 6 0
Selling, general and administrative 4,740 3,333 13,431 9,504
Share-based compensation 1,327 823 3,959 1,891
Transactions and integration related costs 0   0  
Total operating costs and expenses 8,470 5,036 20,877 13,292
Operating loss (8,034) (5,036) (20,441) (13,292)
Depletion, depreciation and amortization 900 $ 620 2,260 $ 1,720
Segment Reporting, Reconciling Item, Corporate Nonsegment        
Segment Reporting Information [Line Items]        
Revenues (Note 18) 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  
Transactions and integration related costs 9,030   22,145  
Total operating costs and expenses 9,030   22,145  
Operating loss $ (9,030)   $ (22,145)