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Demonstration Plant (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Demonstration plant    
Plant operating expense $ 855 $ 1,466
Personnel    
Demonstration plant    
Plant operating expense 645 1,013
Reagents    
Demonstration plant    
Plant operating expense 22 13
Repairs and maintenance    
Demonstration plant    
Plant operating expense 31 10
Supplies    
Demonstration plant    
Plant operating expense 98 292
Testwork    
Demonstration plant    
Plant operating expense 3 102
Office trailer rental    
Demonstration plant    
Plant operating expense 7 17
Other    
Demonstration plant    
Plant operating expense $ 49 $ 19