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Significant accounting policies - Additional information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Statement [line items]    
Plant And Equipment Useful Life 3 years  
Driver IC CGU    
Statement [line items]    
Annual discount rate 11.98% 8.05%
WLO CGU    
Statement [line items]    
Annual discount rate 15.34% 13.33%
Growth rate used to extrapolate cash flow projections 2.18% 2.46%
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