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Document and Entity Information
 12 Months Ended
Dec. 31, 2019
shares
Document and Entity Information [Abstract]  
Document Type 20-F
Document Registration Statement false
Document Annual Report true
Document Transition Report false
Document Shell Company Report false
Amendment Flag false
Document Period End Date Dec. 31, 2019
Document Fiscal Year Focus 2019
Document Fiscal Period Focus FY
Entity Registrant Name Himax Technologies, Inc.
Entity Central Index Key 0001342338
Current Fiscal Year End Date --12-31
Entity Well-known Seasoned Issuer Yes
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Interactive Data Current Yes
Entity Filer Category Accelerated Filer
Trading Symbol HIMX
Entity Common Stock, Shares Outstanding 344,368,062
Entity Shell Company false
Entity Emerging Growth Company false