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Summary of significant accounting policies, Fixed assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Fixed assets [Abstract]    
Depreciation expense $ 0.9 $ 1.3
Tooling [Member]    
Fixed assets [Abstract]    
Estimated useful life 5 years  
Machinery and Equipment [Member]    
Fixed assets [Abstract]    
Estimated useful life 10 years  
Furniture and Office Equipment [Member] | Minimum [Member]    
Fixed assets [Abstract]    
Estimated useful life 5 years  
Furniture and Office Equipment [Member] | Maximum [Member]    
Fixed assets [Abstract]    
Estimated useful life 10 years  
Computer Software and Equipment [Member] | Minimum [Member]    
Fixed assets [Abstract]    
Estimated useful life 3 years  
Computer Software and Equipment [Member] | Maximum [Member]    
Fixed assets [Abstract]    
Estimated useful life 7 years