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Significant accounting policies - Additional Information (Details) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
IFRS Statement [Line Items]
Plant And Equipment Useful Life	3 years
Weighted Average Basic Number of ADS Equivalent Outstanding	172,854	172,550	172,510
Weighted Average Diluted Number of ADS Equivalent Outstanding	173,383	172,550	172,534
Driver IC CGU [Member]
IFRS Statement [Line Items]
Discount rate applied to cash flow projections	18.28%	13.30%
WLO CGU [Member]
IFRS Statement [Line Items]
Discount rate applied to cash flow projections	15.41%	16.07%
Growth rate used to extrapolate cash flow projections	2.32%	2.04%
Period for average Taiwan economic growth rate	5 years
Technology
IFRS Statement [Line Items]
Assets Acquired Useful Life	7 years
Patent [Member] | Bottom of range [member]
IFRS Statement [Line Items]
Assets Acquired Useful Life	12 years
Patent [Member] | Top of range [member]
IFRS Statement [Line Items]
Assets Acquired Useful Life	15 years
Intellectual Properties [Member]
IFRS Statement [Line Items]
Assets Acquired Useful Life	10 years
Himax semi conductor [Member]
IFRS Statement [Line Items]
Goodwill recognised as of acquisition date	$ 26,846
Himax Display Inc [Member]
IFRS Statement [Line Items]
Goodwill recognised as of acquisition date	$ 1,292
Buildings
IFRS Statement [Line Items]
Useful Life Of Tangible Assets	25 years
Building and improvements | Bottom of range [member]
IFRS Statement [Line Items]
Useful Life Of Tangible Assets	4 years
Building and improvements | Top of range [member]
IFRS Statement [Line Items]
Useful Life Of Tangible Assets	16 years
Machinery | Bottom of range [member]
IFRS Statement [Line Items]
Useful Life Of Tangible Assets	4 years
Machinery | Top of range [member]
IFRS Statement [Line Items]
Useful Life Of Tangible Assets	10 years
Research and development equipment | Bottom of range [member]
IFRS Statement [Line Items]
Useful Life Of Tangible Assets	2 years
Research and development equipment | Top of range [member]
IFRS Statement [Line Items]
Useful Life Of Tangible Assets	6 years
Office furniture and equipment [Member] | Bottom of range [member]
IFRS Statement [Line Items]
Useful Life Of Tangible Assets	3 years
Office furniture and equipment [Member] | Top of range [member]
IFRS Statement [Line Items]
Useful Life Of Tangible Assets	8 years
Others | Bottom of range [member]
IFRS Statement [Line Items]
Useful Life Of Tangible Assets	2 years
Others | Top of range [member]
IFRS Statement [Line Items]
Useful Life Of Tangible Assets	10 years
Software
IFRS Statement [Line Items]
Discount rate applied to cash flow projections	13.23%	13.14%
Growth rate used to extrapolate cash flow projections	2.32%	2.04%
Period for average Taiwan economic growth rate	5 years
Software | Bottom of range [member]
IFRS Statement [Line Items]
Assets Acquired Useful Life	2 years
Useful Life Of Tangible Assets	2 years
Software | Top of range [member]
IFRS Statement [Line Items]
Assets Acquired Useful Life	3 years
Useful Life Of Tangible Assets	15 years

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