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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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