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Significant accounting policies - Calculation of diluted earnings per ordinary share based on treasury stock method (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Significant Accounting Policies [Abstract] |  |  |  |
Profits attributable to Himax Technologies, Inc. stockholders |  | $ 47,134 | $ (13,614) | $ 8,569
Denominator for diluted earnings per ordinary share: |  |  |  |
Weighted average number of ordinary shares outstanding |  | 345,708 | 345,101 | 345,020
Unvested RSUs | [1] | 0 | 0 | 49
Employee stock options | [1] | 1,058 | 0 | 0
Adjusted weighted average number of ordinary shares outstanding |  | 346,766 | 345,101 | 345,069
Diluted earnings per ordinary share attributable to Himax Technologies, Inc. stockholders |  | $ 0.14 | $ (0.04) | $ 0.02
Diluted earnings per ADS attribute to Himax technologies, Inc. stockholders | [2] | $ 0.27 | $ (0.08) | $ 0.05
[1] | Since the Company had net loss for 2019, the unvested RSUs and employee stock options are not being considered with dilutive effect for the year.
[2] | As the Company’s ordinary shares have been quoted on the NASDAQ Global Select Market under the symbol “HIMX” in the form of ADSs and two ordinary shares represent one ADS with effect from August 10, 2009. The number of ADS equivalent outstanding is determined by dividing the number of ordinary shares by two. Therefore, the weighted average number of ADS equivalent outstanding used in basic earnings per ADS for 2018, 2019 and 2020 is 172,510 thousand, 172,550 thousand and 172,854 thousand, respectively. Additionally, the weighted average number of ADS equivalent outstanding used in diluted earnings per ADS for 2018, 2019 and 2020 is 172,534 thousand, 172,550 thousand and 173,383 thousand, respectively. The earnings (loss) per ADS is presented solely for the convenience of the reader and does not represent a measure under IFRS.

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- Definition The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2020-01-01 -Paragraph 70 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2020-en-r&anchor=para_70_b&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator), divided by the weighted average number of ordinary shares outstanding during the period (the denominator), both adjusted for the effects of all dilutive potential ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2020-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2020-en-r&anchor=para_66&doctype=Standard -URIDate 2020-01-01 + Details
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