v3.26.1
REPORTABLE SEGMENTS - Schedule of Segment Reporting Information by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Segment Reporting Information [Line Items]    
Revenues (Note 17) $ 35,838 $ 16,898
Costs applicable to revenues 21,475 18,124
Exploration, development and processing (excluding share-based compensation) 8,094 6,446
Standby 3,336 1,867
Accretion of asset retirement obligations 597 1,073
Selling, general and administrative (excluding share-based compensation) 13,370 12,976
Share-based compensation 3,511 2,605
Transaction and integration related costs 2,383 0
Total operating costs and expenses 52,766 43,091
Operating loss (16,928) (26,193)
Depletion, depreciation and amortization 1,428 1,271
Operating Segments | Uranium Segment    
Segment Reporting Information [Line Items]    
Revenues (Note 17) 35,838 1,355
Costs applicable to revenues 21,475 0
Exploration, development and processing (excluding share-based compensation) 6,290 5,196
Standby 3,336 1,867
Accretion of asset retirement obligations 380 346
Selling, general and administrative (excluding share-based compensation) 2,715 4,659
Share-based compensation 1,195 888
Transaction and integration related costs 0  
Total operating costs and expenses 35,391 12,956
Operating loss 447 (11,601)
Depletion, depreciation and amortization 750 480
Operating Segments | Heavy Mineral Sands Segment    
Segment Reporting Information [Line Items]    
Revenues (Note 17) 0 15,543
Costs applicable to revenues 0 18,124
Exploration, development and processing (excluding share-based compensation) 1,264 1,250
Standby 0 0
Accretion of asset retirement obligations 217 727
Selling, general and administrative (excluding share-based compensation) 6,701 5,206
Share-based compensation 941 1,213
Transaction and integration related costs 0  
Total operating costs and expenses 9,123 26,520
Operating loss (9,123) (10,977)
Depletion, depreciation and amortization 80 90
Operating Segments | Rare Earth Elements Segment    
Segment Reporting Information [Line Items]    
Revenues (Note 17) 0 0
Costs applicable to revenues 0 0
Exploration, development and processing (excluding share-based compensation) 540 0
Standby 0 0
Accretion of asset retirement obligations 0 0
Selling, general and administrative (excluding share-based compensation) 3,954 3,111
Share-based compensation 1,375 504
Transaction and integration related costs 0  
Total operating costs and expenses 5,869 3,615
Operating loss (5,869) (3,615)
Depletion, depreciation and amortization 600 $ 710
Segment Reporting, Reconciling Item, Corporate Nonsegment    
Segment Reporting Information [Line Items]    
Revenues (Note 17) 0  
Costs applicable to revenues 0  
Exploration, development and processing (excluding share-based compensation) 0  
Standby 0  
Accretion of asset retirement obligations 0  
Selling, general and administrative (excluding share-based compensation) 0  
Share-based compensation 0  
Transaction and integration related costs 2,383  
Total operating costs and expenses 2,383  
Operating loss $ (2,383)