Share-Based Compensation - Valuation assumptions (Details)	12 Months Ended
Dec. 31, 2020
Stock Option 2019 Plan [Member]
Valuation assumptions:
Expected dividend yield	3.50%
Stock Option 2019 Plan [Member] \| Minimum [Member]
Valuation assumptions:
Expected volatility	51.96%
Expected term (years)	1 year
Risk-free interest rate	1.69%
Stock Option 2019 Plan [Member] \| Maximum [Member]
Valuation assumptions:
Expected volatility	57.79%
Expected term (years)	1 year 6 months
Risk-free interest rate	1.75%
Imaging Cayman [Member] \| Stock Option 2016 Plan [Member]
Valuation assumptions:
Expected dividend yield	0.00%
Expected volatility	38.04%
Expected term (years)	3 years 1 month 15 days
Risk-free interest rate	0.50%
Imaging Taiwan [Member] \| Stock Option 2016 Plan [Member]
Valuation assumptions:
Expected dividend yield	0.00%
Expected volatility	38.04%
Expected term (years)	3 years 1 month 15 days
Risk-free interest rate	0.50%
Himax Display [Member] \| Stock Option 2015 Plan [Member]
Valuation assumptions:
Expected dividend yield	0.00%
Expected volatility	33.52%
Expected term (years)	3 years 1 month 15 days
Risk-free interest rate	0.65%

Description of option life share options granted.

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- References

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- Definition

The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2020-01-01
-Paragraph 47
-Subparagraph a
-Clause i
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_47_a_i&doctype=Standard
-URIDate 2020-01-01

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The implied yield currently available on zero-coupon government issues of the country in whose currency the exercise price for share options granted is expressed, with a remaining term equal to the expected term of the option being valued (based on the option's remaining contractual life and taking into account the effects of expected early exercise). [Refer: Government [member]]

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- Definition

The percentage of an expected dividend used to calculate the fair value of share options granted.

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