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Material accounting policies - Additional information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Driver IC CGU    
Statement [line items]    
Annual discount rate 9.04% 9.95%
WLO CGU    
Statement [line items]    
Annual discount rate 13.78% 13.96%
Growth rate used to extrapolate cash flow projections 2.48% 2.60%
Period for average Taiwan economic growth rate 5 years  
Technology    
Statement [line items]    
Assets Acquired Useful Life 7 years  
Patent | Bottom of range    
Statement [line items]    
Assets Acquired Useful Life 12 years  
Patent | Top of range    
Statement [line items]    
Assets Acquired Useful Life 15 years  
Intellectual Properties    
Statement [line items]    
Assets Acquired Useful Life 10 years  
Himax semi conductor    
Statement [line items]    
Goodwill recognised as of acquisition date $ 26,846  
Himax Display (USA) Inc.    
Statement [line items]    
Goodwill recognised as of acquisition date $ 1,292  
Buildings    
Statement [line items]    
Useful Life Of Tangible Assets 25 years  
Building and improvements | Bottom of range    
Statement [line items]    
Useful Life Of Tangible Assets 4 years  
Building and improvements | Top of range    
Statement [line items]    
Useful Life Of Tangible Assets 16 years  
Machinery | Bottom of range    
Statement [line items]    
Useful Life Of Tangible Assets 4 years  
Machinery | Top of range    
Statement [line items]    
Useful Life Of Tangible Assets 10 years  
Research and development equipment | Bottom of range    
Statement [line items]    
Useful Life Of Tangible Assets 2 years  
Research and development equipment | Top of range    
Statement [line items]    
Useful Life Of Tangible Assets 6 years  
Office furniture and equipment [Member] | Bottom of range    
Statement [line items]    
Useful Life Of Tangible Assets 3 years  
Office furniture and equipment [Member] | Top of range    
Statement [line items]    
Useful Life Of Tangible Assets 8 years  
Other property, plant and equipment [member] | Bottom of range    
Statement [line items]    
Useful Life Of Tangible Assets 2 years  
Other property, plant and equipment [member] | Top of range    
Statement [line items]    
Useful Life Of Tangible Assets 10 years  
Software | Bottom of range    
Statement [line items]    
Assets Acquired Useful Life 2 years  
Useful Life Of Tangible Assets 2 years  
Software | Top of range    
Statement [line items]    
Assets Acquired Useful Life 10 years  
Useful Life Of Tangible Assets 10 years