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Share-Based Compensation - Stock option activity (Details)
 12 Months Ended
Sep. 25, 2020
$ / shares
Aug. 11, 2020
$ / shares
Mar. 31, 2020
$ / shares
Dec. 31, 2020
$ / shares
Dec. 31, 2019
$ / shares
Dec. 31, 2018
$ / shares
Dec. 31, 2017
$ / shares
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items]              
Number of shares, Balance       2,226,690      
Number of shares, Granted       163,500 2,226,690    
Number of shares, Exercised       (1,574,869)      
Number of shares, Forfeited       (236,853)      
Number of shares, Balance       578,468 2,226,690    
Number of shares, Exercisable       578,468      
Weighted average exercise price of share options outstanding in share-based payment arrangement at beginning of period       $ 2.27      
Weighted average exercise price, Granted       3.05 $ 2.27    
Weighted average exercise price, Exercised       2.32      
Weighted average exercise price, Forfeited       2.30      
Weighted average exercise price of share options outstanding in share-based payment arrangement at end of period       2.36 $ 2.27    
Weighted average exercise price of share options exercisable in share-based payment arrangement       $ 2.36      
Weighted average remaining contractual term, Granted (in years)       10 months 17 days 1 year 9 months    
Weighted average remaining contractual term, Balance (in years)       6 months 15 days 1 year 6 months    
Stock Option 2019 Plan [Member]              
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items]              
Number of shares, Granted 10,000 39,000 114,500        
Weighted average exercise price, Granted $ 3.35 $ 3.90 $ 2.74        
Imaging Cayman [Member]              
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items]              
Number of shares, Balance       0 546,000 581,000  
Number of shares, Granted         0 0  
Number of shares, Exercised         0 0  
Number of shares, Forfeited         (25,000) (35,000)  
Number of shares, Expired         (521,000)    
Number of shares, Balance         0 546,000 581,000
Number of shares, Exercisable         0    
Weighted average exercise price of share options outstanding in share-based payment arrangement at beginning of period       $ 0.0000 $ 0.9139 $ 0.9139  
Weighted average exercise price, Granted         0.0000 0.0000  
Weighted average exercise price, Exercised         0.0000 0.0000  
Weighted average exercise price, Forfeited         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
Weighted average exercise price of share options exercisable in share-based payment arrangement         $ 0.0000    
Weighted average remaining contractual term, Balance (in years)         0 years 1 year 2 years
Imaging Taiwan [Member]              
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items]              
Number of shares, Balance       15,000 1,359,000 1,509,000  
Number of shares, Granted         0 0  
Number of shares, Exercised         0 0  
Number of shares, Forfeited         (209,000) (150,000)  
Number of shares, Expired       (15,000) (1,135,000)    
Number of shares, Balance       0 15,000 1,359,000 1,509,000
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  
Weighted average exercise price, Exercised         0.0000 0.0000  
Weighted average exercise price, Forfeited         0.9139 0.9139  
Weighted average exercise price, Expired       0.9139 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)       0 years 0 years 1 year 2 years
Himax Display Inc [Member]              
Disclosure Of Share Based Payment Arrangements Explanatory [Line Items]              
Number of shares, Balance       0 1,911,000 1,943,000  
Number of shares, Granted         0 0  
Number of shares, Exercised         0 0  
Number of shares, Forfeited         (22,200) (32,000)  
Number of shares, Expired         (1,888,800)    
Number of shares, Balance         0 1,911,000 1,943,000
Number of shares, Exercisable         0    
Weighted average exercise price of share options outstanding in share-based payment arrangement at beginning of period       $ 0.0000 $ 1.9860 $ 1.9860  
Weighted average exercise price, Granted         0.0000 0.0000  
Weighted average exercise price, Exercised         0.0000 0.0000  
Weighted average exercise price, Forfeited         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
Weighted average exercise price of share options exercisable in share-based payment arrangement         $ 0.0000    
Weighted average remaining contractual term, Balance (in years)         0 years 9 months 1 year 9 months