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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
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Significant Accounting Policies [Abstract]      
Profits attributable to Himax Technologies, Inc. stockholders $ (13,614) $ 8,569 $ 27,680
Denominator for diluted earnings per ordinary share:      
Weighted average number of ordinary shares outstanding 345,101 345,020 344,849
Unvested RSUs [1] 0 49 54
Adjusted weighted average number of ordinary shares outstanding 345,101 345,069 344,903
Diluted earnings per ordinary share attributable to Himax Technologies, Inc. stockholders $ (0.04) $ 0.02 $ 0.08
Diluted earnings per ADS attribute to Himax technologies, Inc. stockholders [2] $ (0.08) $ 0.05 $ 0.16
[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 2017, 2018 and 2019 is 172,425 thousand, 172,510 thousand and 172,550 thousand, respectively. Additionally, the weighted average number of ADS equivalent outstanding used in diluted earnings per ADS for 2017, 2018 and 2019 is 172,452 thousand, 172,534 thousand and 172,550 thousand, respectively. The earnings (loss) per ADS is presented solely for the convenience of the reader and does not represent a measure under IFRS.