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Schedule of Segment Reporting Information by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment Reporting Information [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax $ 4,212 $ 8,719 $ 21,110 $ 34,145
Cost of Revenue 3,655 3,681 21,779 14,733
Exploration, Development, Permitting And Land Holding 9,075 2,487 15,521 5,292
Standby Costs 1,780 1,663 3,647 2,996
Accretion of asset retirement obligations 862 313 1,935 589
Selling, general and administrative (excluding share-based compensation) 12,130 5,671 25,106 11,516
Share-based compensation 2,885 1,412 5,490 2,757
Transactions and integration related costs 0 2,536 0 3,285
Costs and Expenses 30,387 17,763 73,478 41,168
Operating Income (Loss), Total (26,175) (9,044) (52,368) (7,023)
Depletion, depreciation and amortization     2,611 1,858
Operating Segments | Uranium Segment        
Segment Reporting Information [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 3,934 8,719 5,289 34,145
Cost of Revenue 2,659 3,681 2,659 14,733
Exploration, Development, Permitting And Land Holding 4,729 617 9,925 957
Standby Costs 1,780 1,663 3,647 2,996
Accretion of asset retirement obligations 356 313 702 589
Selling, general and administrative (excluding share-based compensation) 2,534 2,892 7,193 6,093
Share-based compensation 520 759 1,408 1,518
Transactions and integration related costs   0   0
Costs and Expenses 12,578 9,925 25,534 26,886
Operating Income (Loss), Total (8,644) (1,206) (20,245) 7,259
Depletion, depreciation and amortization 790 570 1,410 1,120
Operating Segments | Heavy Mineral Sands Segment        
Segment Reporting Information [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 278 0 15,821 0
Cost of Revenue 996 0 19,120 0
Exploration, Development, Permitting And Land Holding 3,329 526 4,579 929
Standby Costs 0 0 0 0
Accretion of asset retirement obligations 506 0 1,233 0
Selling, general and administrative (excluding share-based compensation) 6,535 1,028 11,741 2,035
Share-based compensation 1,801 187 3,015 383
Transactions and integration related costs   0   0
Costs and Expenses 13,167 1,741 39,688 3,347
Operating Income (Loss), Total (12,889) (1,741) (23,867) (3,347)
Depletion, depreciation and amortization 50 60 100 100
Operating Segments | Rare Earth Elements Segment        
Segment Reporting Information [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax 0 0 0 0
Cost of Revenue 0 0 0 0
Exploration, Development, Permitting And Land Holding 1,017 1,344 1,017 3,406
Standby Costs 0 0 0 0
Accretion of asset retirement obligations 0 0 0 0
Selling, general and administrative (excluding share-based compensation) 3,061 1,751 6,172 3,388
Share-based compensation 564 466 1,067 856
Transactions and integration related costs   0   0
Costs and Expenses 4,642 3,561 8,256 7,650
Operating Income (Loss), Total (4,642) (3,561) (8,256) (7,650)
Depletion, depreciation and amortization $ 590 0 1,100 80
Segment Reporting, Reconciling Item, Corporate Nonsegment        
Segment Reporting Information [Line Items]        
Revenue from Contract with Customer, Excluding Assessed Tax   0 0 0
Cost of Revenue   0 0 0
Exploration, Development, Permitting And Land Holding   0 0 0
Standby Costs   0 0 0
Accretion of asset retirement obligations   0 0 0
Selling, general and administrative (excluding share-based compensation)   0 0 0
Share-based compensation   0 0 0
Transactions and integration related costs   2,536   3,285
Costs and Expenses   2,536 0 3,285
Operating Income (Loss), Total   $ (2,536) $ 0 $ (3,285)