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Share-Based Compensation (Details 4)
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Imaging Cayman [Member]    
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items]    
Number of shares, Balance 581,000 616,000
Number of shares, Granted 0 0
Number of shares, Exercised 0 0
Number of shares, Forfeited (35,000) (35,000)
Number of shares, Balance 546,000 581,000
Number of shares, Exercisable 285,500  
Weighted average exercise price, Balance $ 0.9139 $ 0.9139
Weighted average exercise price, Granted 0 0
Weighted average exercise price, Exercised 0 0
Weighted average exercise price, Forfeited 0.9139 0.9139
Weighted average exercise price, Balance 0.9139 $ 0.9139
Weighted average exercise price, Exercisable $ 0.9139  
Weighted average remaining contractual term, Balance (in years) 2.0 3.0
Weighted average remaining contractual term, Balance (in years) 1.0 2.0
Imaging Taiwan [Member]    
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items]    
Number of shares, Balance 1,509,000 1,797,000
Number of shares, Granted 0 0
Number of shares, Exercised 0 (115,000)
Number of shares, Forfeited (150,000) (173,000)
Number of shares, Balance 1,359,000 1,509,000
Number of shares, Exercisable 645,000  
Weighted average exercise price, Balance $ 0.9139 $ 0.9139
Weighted average exercise price, Granted 0 0
Weighted average exercise price, Exercised 0 0.9139
Weighted average exercise price, Forfeited 0.9139 0.9139
Weighted average exercise price, Balance 0.9139 $ 0.9139
Weighted average exercise price, Exercisable $ 0.9139  
Weighted average remaining contractual term, Balance (in years) 2.0 3.0
Weighted average remaining contractual term, Balance (in years) 1.0 2.0
Himax Display Inc [Member]    
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items]    
Number of shares, Balance 1,943,000 1,993,000
Number of shares, Granted 0 0
Number of shares, Exercised 0 0
Number of shares, Forfeited (32,000) (50,000)
Number of shares, Balance 1,911,000 1,943,000
Number of shares, Exercisable 1,911,000  
Weighted average exercise price, Balance $ 1.986 $ 1.986
Weighted average exercise price, Granted 0 0
Weighted average exercise price, Exercised 0 0
Weighted average exercise price, Forfeited 1.986 1.986
Weighted average exercise price, Balance 1.986 $ 1.986
Weighted average exercise price, Exercisable $ 1.986  
Weighted average remaining contractual term, Balance (in years) 1.75 2.75
Weighted average remaining contractual term, Balance (in years) 0.75 1.75