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Material accounting policies - Additional information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Driver IC CGU      
Statement [line items]      
Annual discount rate 9.95% 11.98%  
WLO CGU      
Statement [line items]      
Annual discount rate 13.96% 15.38%  
Growth rate used to extrapolate cash flow projections 2.60% 2.18%  
Period for average Taiwan economic growth rate 5 years    
CMOS CGU      
Statement [line items]      
Annual discount rate     11.40%
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      
Statement [line items]      
Growth rate used to extrapolate cash flow projections     2.46%
Period for average Taiwan economic growth rate 5 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