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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure Of Property Plant And Equipment [Line Items]    
Net book value at beginning of the year [1] $ 9,245  
Net book value at ending of the year 8,988 $ 9,245 [1]
Cost    
Disclosure Of Property Plant And Equipment [Line Items]    
Net book value at beginning of the year 11,375 12,732
Transfers from E&E   9,514
Acquisition of Arena Minerals   55
Additions 971 124,186
Disposals (701) (380)
Assets distributed upon separation   (134,732)
Net book value at ending of the year 11,645 11,375
Accumulated Depreciation    
Disclosure Of Property Plant And Equipment [Line Items]    
Net book value at beginning of the year (2,130) (3,706)
Depreciation for the period 758 2,140
Disposals 231 166
Assets distributed upon separation   (3,550)
Net book value at ending of the year (2,657) (2,130)
Thacker Pass Project    
Disclosure Of Property Plant And Equipment [Line Items]    
Net book value at beginning of the year 0  
Net book value at ending of the year 0 0
Thacker Pass Project | Cost    
Disclosure Of Property Plant And Equipment [Line Items]    
Net book value at beginning of the year 0 0
Transfers from E&E   9,514
Acquisition of Arena Minerals   0
Additions 0 118,454
Disposals 0 0
Assets distributed upon separation   (127,968)
Net book value at ending of the year 0 0
Thacker Pass Project | Accumulated Depreciation    
Disclosure Of Property Plant And Equipment [Line Items]    
Net book value at beginning of the year 0 0
Depreciation for the period 0 0
Disposals 0 0
Assets distributed upon separation   0
Net book value at ending of the year 0 0
Buildings    
Disclosure Of Property Plant And Equipment [Line Items]    
Net book value at beginning of the year 4,857  
Net book value at ending of the year 5,437 4,857
Buildings | Cost    
Disclosure Of Property Plant And Equipment [Line Items]    
Net book value at beginning of the year 5,203 1,674
Transfers from E&E   0
Acquisition of Arena Minerals   0
Additions 660 3,529
Disposals 0 0
Assets distributed upon separation   0
Net book value at ending of the year 5,863 5,203
Buildings | Accumulated Depreciation    
Disclosure Of Property Plant And Equipment [Line Items]    
Net book value at beginning of the year (346) (106)
Depreciation for the period 80 240
Disposals 0 0
Assets distributed upon separation   0
Net book value at ending of the year (426) (346)
Equipment and Machinery    
Disclosure Of Property Plant And Equipment [Line Items]    
Net book value at beginning of the year 2,576  
Net book value at ending of the year 2,549 2,576
Equipment and Machinery | Cost    
Disclosure Of Property Plant And Equipment [Line Items]    
Net book value at beginning of the year 2,716 4,991
Transfers from E&E   0
Acquisition of Arena Minerals   0
Additions 0 239
Disposals 0 (98)
Assets distributed upon separation   (2,416)
Net book value at ending of the year 2,716 2,716
Equipment and Machinery | Accumulated Depreciation    
Disclosure Of Property Plant And Equipment [Line Items]    
Net book value at beginning of the year (140) (1,327)
Depreciation for the period 27 466
Disposals 0 0
Assets distributed upon separation   (1,653)
Net book value at ending of the year (167) (140)
Other    
Disclosure Of Property Plant And Equipment [Line Items]    
Net book value at beginning of the year 1,812  
Net book value at ending of the year 1,002 1,812
Other | Cost    
Disclosure Of Property Plant And Equipment [Line Items]    
Net book value at beginning of the year 3,456 6,067
Transfers from E&E   0
Acquisition of Arena Minerals   55
Additions 311 1,964
Disposals (701) (282)
Assets distributed upon separation   (4,348)
Net book value at ending of the year 3,066 3,456
Other | Accumulated Depreciation    
Disclosure Of Property Plant And Equipment [Line Items]    
Net book value at beginning of the year (1,644) (2,273)
Depreciation for the period 651 1,434
Disposals 231 166
Assets distributed upon separation   (1,897)
Net book value at ending of the year $ (2,064) $ (1,644)
[1] The comparative information has been reclassified as discussed in Note 13 and Note 14.