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Share-Based Compensation - Additional information (Details) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended |  |  |  |  |  |  |  |  |
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Sep. 28, 2022 USD ($) | Jan. 28, 2022 $ / shares shares | Sep. 28, 2021 USD ($) | Jun. 29, 2021 | Jun. 28, 2021 USD ($) $ / shares shares | Jun. 28, 2021 $ / shares shares | Mar. 19, 2021 | Sep. 28, 2020 USD ($) | Sep. 25, 2020 $ / shares shares | Aug. 11, 2020 $ / shares shares | Mar. 31, 2020 $ / shares shares | Sep. 30, 2019 $ / shares shares | Sep. 23, 2019 USD ($) shares | Mar. 19, 2019 $ / shares shares | Mar. 19, 2019 $ / shares shares | Mar. 01, 2019 | Sep. 26, 2018 USD ($) | Sep. 29, 2017 USD ($) | Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 $ / shares | Dec. 31, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2018
Share-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation risk free interest rate expected term |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Weighted average exercise price, Granted | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20.49 |  |  |  |  |  |  |  |  |  |  |  |
Compensation expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 140,000 | $ 38,000 | $ 8,000 |  |  |  |  |  |  |  |  |  |
Percentage of restricted stock units grant vested | 86.41 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated fairvalue market price of ADS | $ 5.09 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of share authorized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 150,940 |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock units |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,000,000 | $ 23,760,000 | $ 4,833,000 |  |  |  |  |  |  |  |  |  |
Number of RSUs granted in share-based payment arrangement | 3,987,509 |  | 2,604,545 |  |  |  |  | 1,402,714 |  |  |  |  |  |  |  |  | 676,273 | 580,235 | 3,987,509 | 2,604,545 | 1,402,714 |  |  |  |  |  |  |  |  |  |
Percentage of restricted stock units grant vested |  |  | 85.63 |  |  |  |  | 98.68 |  |  |  |  |  |  |  |  | 97.15 | 96.91 |  |  |  |  |  |  |  |  |  |  |  |  |
percentage of vested settled by ordinary shares one |  |  |  |  |  |  |  |  |  |  |  | 0.95 |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.53 |  | 4.79 | 0.44 |  | 1.03
percentage of vested settled by ordinary shares two |  |  |  |  |  |  |  |  |  |  |  | 1.03 |  |  |  |  |  |  |  |  |  |  |  | 4.53 |  |  | 4.79 | 0.44 |  | 0.95 |
percentage of vested settled by ordinary shares three |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.53 |  | 4.79 |  | 0.44 |  | 0.95 | 1.03 |
Estimated fairvalue market price of ADS |  |  | $ 10.39 |  |  |  |  | $ 3.44 |  |  |  |  |  |  |  |  | $ 5.76 | $ 10.93 |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock unit settle by shares | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 235,910 | 14,264 | 16,302 |  |  |  |  |  |  |  |  |  |
Weighted average remaining contractual life of unvested RSUs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years 5 months 4 days |  |  |  |  |  |  |  |  |  |  |  |
Compensation Cost Not Yet Recognized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,506,000 |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock units settled by cash | $ 17,535,000 |  | $ 23,174,000 |  |  |  |  | $ 4,762,000 |  |  |  |  |  |  |  |  | $ 3,778,000 | $ 6,147,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Himax Imaging |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price, share options granted | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.36 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liqxtal Technology Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expenses |  |  |  |  | $ 43,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 33,000 |  |  |  |  |  |  |  |  |  |  |  |
Stock Option 2016 Plan | Himax Imaging |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share options contractual life |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share options vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Option 2016 Plan | Imaging Taiwan | One And Half Years After Grant Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Vesting Rights Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Option 2016 Plan | Imaging Taiwan | Three Years After Grant Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Vesting Rights Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Option 2019 Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share options contractual life |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share options vesting period |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of ADS authorized | shares |  |  |  |  |  |  |  |  |  |  |  |  | 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of ADS per stock options granted | shares |  |  |  |  |  |  |  |  | 10,000 | 39,000 | 114,500 | 2,226,690 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average exercise price, Granted | $ / shares |  |  |  |  |  |  |  |  | $ 3.35 | $ 3.9 | $ 2.74 |  |  |  |  |  |  |  |  |  | $ 3.05 | $ 2.27 |  |  |  |  |  |  |  |  |
Compensation expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 570,000 |  |  |  |  |  |  |  |  |  |
Income tax benefits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 103,000 |  |  |  |  |  |  |  |  |  |
Number of share authorized |  |  |  |  |  |  |  |  |  |  |  |  | 6,000,000 |  |  |  |  |  |  |  | 163,500 | 2,226,690 |  |  |  |  |  |  |  |  |
Exercise price, share options granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 524,387 | 1,574,869 |  |  |  |  |  |  |  |  |  |
Exercise price, share options granted | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 2.27 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average remaining contractual life of unvested RSUs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 years | 6 months 14 days |  |  |  |  |  |  |  |  |  |
Stock Option 2019 Plan | Bottom of range |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation risk free interest rate expected term |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Option 2019 Plan | Top of range |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation risk free interest rate expected term |  |  |  |  |  |  |  |  |  |  |  |  | 1 year 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Option 2019 Plan | One Years After Grant Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Vesting Rights Percentage |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Option 2019 Plan | Half years after grant date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Vesting Rights Percentage |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option 2019 plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 122,000 |  |  |  |  |  |  |  |  |  |
Income tax benefits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 29,000 |  |  |  |  |  |  |  |  |  |
Stock options 2021 plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation no of shares authorized | shares |  | 179,690 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price, share options granted | $ / shares |  | $ 20.49 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options 2021 plan | CMVT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average exercise price, Granted | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.36 |  |  |  |  |  |  |  |  |  |  |
Compensation expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 76,000 | $ 71,000 |  |  |  |  |  |  |  |  |  |  |
Income tax benefits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |
Number of share authorized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,791,000 |  |  |  |  |  |  |  |  |  |  |
Maximum number of shares authorized for grant | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,000,000 | 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise price, share options granted | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average remaining contractual life of unvested RSUs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 years 6 months | 3 years 6 months |  |  |  |  |  |  |  |  |  |  |
Stock options 2021 plan | CMVT | ROC Central Government | Bottom of range |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation risk free interest rate expected term |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options 2021 plan | CMVT | ROC Central Government | Top of range |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation risk free interest rate expected term |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options 2021 plan | Liqxtal Technology Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share options contractual life |  |  |  | 1 year 6 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share options vesting period |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation no of shares authorized | shares |  |  |  |  | 1,000,000 | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average exercise price, Granted | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.65 |  |  |  |  |  |  |  |  |  |  |
Number of share authorized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |
Exercise price, share options granted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 840,000 |  |  |  |  |  |  |  |  |  |  |  |
Exercise price, share options granted | (per share) |  |  |  |  | $ 0.65 | $ 18 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average remaining contractual life of unvested RSUs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |  |  |
Stock options 2021 plan | Liqxtal Technology Inc | One Years After Grant Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Vesting Rights Percentage |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options 2021 plan | Liqxtal Technology Inc | ROC Central Government |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation risk free interest rate expected term |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option 2022 plan | Emza Visual Sense Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share options vesting period |  | 4 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Compensation expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 522,000 |  |  |  |  |  |  |  |  |  |  |  |
Compensation expenses on cancelled options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 219,000 |  |  |  |  |  |  |  |  |  |  |  |
Income tax benefits |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |
Stock option 2022 plan | Emza Visual Sense Ltd | One Years After Grant Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Vesting Rights Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |
Stock option 2022 plan | Emza Visual Sense Ltd | 12 equal portions at the end of each 3-month period thereafter |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share Based Compensation Vesting Rights Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75.00% |  |  |  |  |  |  |  |  |  |  |  |

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