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Significant accounting policies (Details)
 12 Months Ended
Jan. 01, 2017
Dec. 31, 2018
Dec. 31, 2017
ROC [Member] | Himax Technologies Limited Himax Taiwan [Member]      
Investor   Himax Technologies, Inc.  
Subsidiary   Himax Technologies Limited (“Himax Taiwan”)  
Main activities   IC design and sales  
Jurisdiction of Incorporation   ROC  
Percentage of Ownership 100.00% 100.00% 100.00%
ROC [Member] | Himax Semiconductor Inc [Member]      
Investor   Himax Technologies, Inc.  
Subsidiary [1]   Himax Semiconductor, Inc.  
Main activities   IC design and sales  
Jurisdiction of Incorporation   ROC  
Percentage of Ownership 100.00% 0.00% 100.00%
ROC [Member] | Himax Display Inc [Member]      
Investor   Himax Technologies Limited  
Subsidiary   Himax Display, Inc.  
Main activities   LCOS and MEMS design, manufacturing and sales  
Jurisdiction of Incorporation   ROC  
Percentage of Ownership 82.55% 82.70% 82.72%
ROC [Member] | Himax Analogic Inc [Member]      
Investor   Himax Technologies Limited  
Subsidiary   Himax Analogic, Inc.  
Main activities   IC design and sales  
Jurisdiction of Incorporation   ROC  
Percentage of Ownership 98.62% 98.62% 98.62%
ROC [Member] | Himax Imaging Ltd Imaging Taiwan [Member]      
Investor   Himax Technologies Limited  
Subsidiary   Himax Imaging, Ltd. (“Imaging Taiwan”)  
Main activities   IC design and sales  
Jurisdiction of Incorporation   ROC  
Percentage of Ownership 93.84% 93.70% 93.72%
ROC [Member] | Himax Media Solutions Inc [Member]      
Investor   Himax Technologies Limited  
Subsidiary   Himax Media Solutions, Inc.  
Main activities   TFT-LCD television, monitor chipset operations, ASIC service and IP licensing  
Jurisdiction of Incorporation   ROC  
Percentage of Ownership 99.21% 99.22% 99.22%
ROC [Member] | Harvest Investment Limited [Member]      
Investor   Himax Technologies Limited  
Subsidiary   Harvest Investment Limited  
Main activities   Investments  
Jurisdiction of Incorporation   ROC  
Percentage of Ownership 100.00% 100.00% 100.00%
ROC [Member] | Liqxtal Technology Inc [Member]      
Investor   Himax Technologies Limited  
Subsidiary   Liqxtal Technology Inc.  
Main activities   LC Lens design and sales  
Jurisdiction of Incorporation   ROC  
Percentage of Ownership 64.00% 64.00% 64.00%
South Korea [Member] | Himax Technologies Korea Ltd [Member]      
Investor   Himax Technologies, Inc.  
Subsidiary   Himax Technologies Korea Ltd.  
Main activities   IC design and sales  
Jurisdiction of Incorporation   South Korea  
Percentage of Ownership 100.00% 100.00% 100.00%
Japan [Member] | Himax Technologies Japan Ltd [Member]      
Investor   Himax Technologies, Inc.  
Subsidiary   Himax Technologies Japan Ltd.  
Main activities   Sales  
Jurisdiction of Incorporation   Japan  
Percentage of Ownership 100.00% 100.00% 100.00%
Hong Kong [Member] | Himax Semiconductor Hong Kong Limited [Member]      
Investor   Himax Technologies, Inc.  
Subsidiary   Himax Semiconductor (Hong Kong) Limited  
Main activities   Investments  
Jurisdiction of Incorporation   Hong Kong  
Percentage of Ownership 100.00% 100.00% 100.00%
Hong Kong [Member] | Integrated Microdisplays Limited [Member]      
Investor   Himax Display, Inc.  
Subsidiary   Integrated Microdisplays Limited  
Main activities   LCOS design  
Jurisdiction of Incorporation   Hong Kong  
Percentage of Ownership 82.55% 82.70% 82.72%
Samoa [Member] | Himax Technologies Samoa Inc [Member]      
Investor   Himax Technologies Limited  
Subsidiary   Himax Technologies (Samoa), Inc.  
Main activities   Investments  
Jurisdiction of Incorporation   Samoa  
Percentage of Ownership 100.00% 100.00% 100.00%
PRC [Member] | Himax Technologies Suzhou Co Ltd [Member]      
Investor   Himax Technologies (Samoa), Inc.  
Subsidiary   Himax Technologies (Suzhou) Co., Ltd.  
Main activities   Sales and technical support  
Jurisdiction of Incorporation   PRC  
Percentage of Ownership 100.00% 100.00% 100.00%
PRC [Member] | Himax Technologies Shenzhen Co Ltd [Member]      
Investor   Himax Technologies (Samoa), Inc.  
Subsidiary   Himax Technologies (Shenzhen) Co., Ltd.  
Main activities   Sales and technical support  
Jurisdiction of Incorporation   PRC  
Percentage of Ownership 100.00% 100.00% 100.00%
Delaware USA [Member] | Himax Display USA Inc [Member]      
Investor   Himax Display, Inc.  
Subsidiary   Himax Display (USA) Inc.  
Main activities   LCOS and MEMS design, sales and technical support  
Jurisdiction of Incorporation   Delaware, USA  
Percentage of Ownership 82.55% 82.70% 82.72%
Delaware USA [Member] | Himax IGI Precision Ltd [Member]      
Investor   Himax Technologies Limited  
Subsidiary [2]   Himax IGI Precision Ltd.  
Main activities   3D micro and nano structure mastering and prototype replication  
Jurisdiction of Incorporation   Delaware, USA  
Percentage of Ownership 0.00% 100.00% 100.00%
Cayman Islands [Member] | Himax Imaging Inc [Member]      
Investor   Himax Technologies, Inc.  
Subsidiary   Himax Imaging, Inc.  
Main activities   Investments  
Jurisdiction of Incorporation   Cayman Islands  
Percentage of Ownership 100.00% 100.00% 100.00%
California USA [Member] | Himax Imaging Corp [Member]      
Investor   Himax Imaging, Ltd.  
Subsidiary   Himax Imaging Corp.  
Main activities   IC design  
Jurisdiction of Incorporation   California, USA  
Percentage of Ownership 93.84% 93.70% 93.72%
Israel [Member] | Emza Visual Sense Ltd [Member]      
Investor   Himax Technologies Limited  
Subsidiary [3]   Emza Visual Sense Ltd.  
Main activities   Visual sensors and efficient machine vision algorithm  
Jurisdiction of Incorporation   Israel  
Percentage of Ownership 0.00% 100.00% 45.10%
[1] For management purpose, Himax Semiconductor Inc. was merged into Himax Technologies Limited on July 2, 2018.
[2] Himax IGI Precision Ltd. was newly incorporated on December 14, 2017, which is wholly owned by Himax Technologies Limited.
[3] Emza Visual Sense Ltd. was wholly acquired by Himax Technologies Limited and becomes a subsidiary of the Company from June 28, 2018.