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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

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