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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure Of Significant Accounting Policies [Abstract]      
Net income attributable to Himax Technologies, Inc. stockholders $ 236,982 $ 436,896 $ 47,134
Denominator for diluted earnings per ordinary share:      
Weighted average number of ordinary shares outstanding 349,448 349,228 345,708
Unvested RSUs 187 505 0
Employee stock options 0 0 1,058
Adjusted weighted average number of ordinary shares outstanding 349,635 349,733 346,766
Diluted earnings per ordinary share attributable to Himax Technologies, Inc. stockholders $ 0.68 $ 1.25 $ 0.14
Diluted earnings per ADS attributable to Himax Technologies, Inc. stockholders $ 1.36 $ 2.50 $ 0.27
Weighted Average Basic Number of ADS Equivalent Outstanding 174,724 174,614 172,854
Weighted Average Diluted Number of ADS Equivalent Outstanding 174,817 174,867 173,383