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Schedule of Segment Reporting Information by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Segment Reporting Information [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax $ 16,898 $ 25,426
Cost of Revenue 18,124 11,052
Exploration, Development, Permitting And Land Holding 6,446 2,805
Standby Costs 1,867 1,333
Accretion of asset retirement obligations 1,073 276
Selling, General and Administrative Expense, Excluding Share-Based Payment Arrangement, Expense 12,976 6,594
Share-based Payment Arrangement, Expense 2,605 1,345
Costs and Expenses 43,091 23,405
Operating Income (Loss), Total (26,193) 2,021
Depletion, depreciation and amortization 1,271 668
Operating Segments | Uranium Segment    
Segment Reporting Information [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax 1,355 25,426
Cost of Revenue 0 11,052
Exploration, Development, Permitting And Land Holding 5,196 340
Standby Costs 1,867 1,333
Accretion of asset retirement obligations 346 276
Selling, General and Administrative Expense, Excluding Share-Based Payment Arrangement, Expense 4,659 3,231
Share-based Payment Arrangement, Expense 888 759
Costs and Expenses 12,956 16,991
Operating Income (Loss), Total (11,601) 8,435
Depletion, depreciation and amortization 480 550
Operating Segments | Heavy Mineral Sands Segment    
Segment Reporting Information [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax 15,543 0
Cost of Revenue 18,124 0
Exploration, Development, Permitting And Land Holding 1,250 404
Standby Costs 0 0
Accretion of asset retirement obligations 727 0
Selling, General and Administrative Expense, Excluding Share-Based Payment Arrangement, Expense 5,206 1,014
Share-based Payment Arrangement, Expense 1,213 196
Costs and Expenses 26,520 1,614
Operating Income (Loss), Total (10,977) (1,614)
Depletion, depreciation and amortization 90 40
Operating Segments | Rare Earth Elements Segment    
Segment Reporting Information [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax 0 0
Cost of Revenue 0 0
Exploration, Development, Permitting And Land Holding 0 2,061
Standby Costs 0 0
Accretion of asset retirement obligations 0 0
Selling, General and Administrative Expense, Excluding Share-Based Payment Arrangement, Expense 3,111 1,653
Share-based Payment Arrangement, Expense 504 390
Costs and Expenses 3,615 4,104
Operating Income (Loss), Total (3,615) (4,104)
Depletion, depreciation and amortization $ 710 80
Segment Reporting, Reconciling Item, Corporate Nonsegment    
Segment Reporting Information [Line Items]    
Revenue from Contract with Customer, Excluding Assessed Tax   0
Cost of Revenue   0
Exploration, Development, Permitting And Land Holding   0
Standby Costs   0
Accretion of asset retirement obligations   0
Selling, General and Administrative Expense, Excluding Share-Based Payment Arrangement, Expense   696
Share-based Payment Arrangement, Expense   0
Costs and Expenses   696
Operating Income (Loss), Total   $ (696)