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Himax Technologies, Inc. (the Parent Company only) - Condensed Statements of Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
IFRS Statement [Line Items]      
Profit (loss) for the year $ 45,160 $ (16,184) $ 6,026
Other comprehensive income:      
Remeasurements of defined benefit pension plans (214) 214 1,302
Unrealized gain (loss) on financial assets at fair value through other comprehensive income 65 (35) (702)
Income tax related to items that will not be reclassified subsequently 38 (25) (169)
Foreign operations - foreign currency translation differences 556 (545) (336)
Other comprehensive income for the year, net of tax 445 (391) 95
Total comprehensive income for the year 45,605 (16,575) 6,121
Equity attributable to owners of parent [member]      
IFRS Statement [Line Items]      
Profit (loss) for the year 47,134 (13,614) 8,569
Other comprehensive income:      
Remeasurements of defined benefit pension plans (213) 197 1,269
Unrealized gain (loss) on financial assets at fair value through other comprehensive income 67 (30) (676)
Income tax related to items that will not be reclassified subsequently 38 (25) (169)
Foreign operations - foreign currency translation differences 512 (545) (334)
Other comprehensive income for the year, net of tax 404 (403) 90
Total comprehensive income for the year $ 47,538 $ (14,017) $ 8,659