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Share-Based Compensation - Stock option activity (Details)
 12 Months Ended
Dec. 31, 2019
$ / shares
Dec. 31, 2018
$ / shares
Dec. 31, 2017
$ / shares
Dec. 31, 2016
$ / shares
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items]        
Number of shares, Granted 2,226,690      
Number of shares, Balance 2,226,690      
Weighted average exercise price, Granted $ 2.27      
Weighted average exercise price of share options outstanding in share-based payment arrangement at end of period $ 2.27      
Weighted average remaining contractual term, Granted (in years) 1 year 9 months      
Weighted average remaining contractual term, Balance (in years) 1 year 6 months      
Imaging Cayman [Member]        
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items]        
Number of shares, Balance 546,000 581,000 616,000  
Number of shares, Granted 0 0 0  
Number of shares, Exercised 0 0 0  
Number of shares, Forfeited (25,000) (35,000) (35,000)  
Number of shares, Expired (521,000)      
Number of shares, Balance 0 546,000 581,000 616,000
Number of shares, Exercisable 0      
Weighted average exercise price of share options outstanding in share-based payment arrangement at beginning of period $ 0.9139 $ 0.9139 $ 0.9139  
Weighted average exercise price, Granted 0.0000 0.0000 0.0000  
Weighted average exercise price, Exercised 0.0000 0.0000 0.0000  
Weighted average exercise price, Forfeited 0.9139 0.9139 0.9139  
Weighted average exercise price, Expired 0.9139      
Weighted average exercise price of share options outstanding in share-based payment arrangement at end of period 0.0000 $ 0.9139 $ 0.9139 $ 0.9139
Weighted average exercise price of share options exercisable in share-based payment arrangement $ 0.0000      
Weighted average remaining contractual term, Balance (in years)   1 year 2 years 3 years
Imaging Taiwan [Member]        
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items]        
Number of shares, Balance 1,359,000 1,509,000 1,797,000  
Number of shares, Granted 0 0 0  
Number of shares, Exercised 0 0 115,000  
Number of shares, Forfeited (209,000) (150,000) (173,000)  
Number of shares, Expired (1,135,000)      
Number of shares, Balance 15,000 1,359,000 1,509,000 1,797,000
Number of shares, Exercisable 15,000      
Weighted average exercise price of share options outstanding in share-based payment arrangement at beginning of period $ 0.9139 $ 0.9139 $ 0.9139  
Weighted average exercise price, Granted 0.0000 0.0000 0.0000  
Weighted average exercise price, Exercised 0.0000 0.0000 0.9139  
Weighted average exercise price, Forfeited 0.9139 0.9139 0.9139  
Weighted average exercise price, Expired 0.9139      
Weighted average exercise price of share options outstanding in share-based payment arrangement at end of period 0.9139 $ 0.9139 $ 0.9139 $ 0.9139
Weighted average exercise price of share options exercisable in share-based payment arrangement $ 0.9139      
Weighted average remaining contractual term, Balance (in years)   1 year 2 years 3 years
Himax Display Inc [Member]        
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items]        
Number of shares, Balance 1,911,000 1,943,000 1,993,000  
Number of shares, Granted 0 0 0  
Number of shares, Exercised 0 0 0  
Number of shares, Forfeited (22,200) (32,000) (50,000)  
Number of shares, Expired (1,888,800)      
Number of shares, Balance 0 1,911,000 1,943,000 1,993,000
Number of shares, Exercisable 0      
Weighted average exercise price of share options outstanding in share-based payment arrangement at beginning of period $ 1.9860 $ 1.9860 $ 1.9860  
Weighted average exercise price, Granted 0.0000 0.0000 0.0000  
Weighted average exercise price, Exercised 0.0000 0.0000 0.0000  
Weighted average exercise price, Forfeited 1.9860 1.9860 1.9860  
Weighted average exercise price, Expired 1.9860      
Weighted average exercise price of share options outstanding in share-based payment arrangement at end of period 0.0000 $ 1.9860 $ 1.9860 $ 1.9860
Weighted average exercise price of share options exercisable in share-based payment arrangement $ 0.0000      
Weighted average remaining contractual term, Balance (in years)   9 months 1 year 9 months 2 years 9 months