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Equity - Noncontrolling interest (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Equity      
Balance at the beginning of year $ 2,258 $ 5,023 $ (1,743)
Equity attributable to non-controlling interests      
Loss for the year (1,515) (2,961) (1,974)
Changes in fair value of financial assets 10 (2) (2)
Remeasurement of defined benefit pension plans 26 5 (1)
Share-based compensation expenses 140 38 8
New shares issued by subsidiary 445 0 8,695
Purchase of subsidiary shares from noncontrolling interests 0 175  
Effect of Himax Media Solutions, Inc. merged into Himax Taiwan (197) 0  
Disposal of financial assets at fair value through other comprehensive income (6) 0  
Exchange differences arising on translation of foreign operations 88 0 44
Declaration of cash dividends 0 (20) (4)
Balance at the end of year $ 1,249 $ 2,258 $ 5,023