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Property and Equipment (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2024
Dec. 31, 2023
Property and Equipment      
Property and equipment, net $ 11,433,000 $ 11,316,000 $ 35,000
Depreciation expense 871,000 1,331,000 40,000
Machinery and equipment      
Property and Equipment      
Spare parts currently not in use and not subject to depreciation 318,000 190,000 0
Foreign - Netherlands      
Property and Equipment      
Property and equipment, net 1,108,000    
South Africa      
Property and Equipment      
Property and equipment, net 414,000    
Cost of sales      
Property and Equipment      
Depreciation expense 847,000 1,267,000  
Sales, general and administrative expenses      
Property and Equipment      
Depreciation expense $ 24,000 $ 64,000 $ 40,000