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Taxation - Tax-losses carry forward (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2019 | Dec. 31, 2020
Taxation |  |  |  |
Tax loss carryforwards | $ 5,900 | $ 5,747 |  | $ 5,218
Effective rate for Innovation Box profits | 9.00% | 9.00% |  |
Amount of tax returns | $ 27,800 | $ 33,900 | $ 14,600 |
IP development costs | 84,100 |  |  |
Accounting-to-tax differences |  |  |  |
Taxation |  |  |  |
Accounting-to-tax differences | (32,000) |  |  |
2017 |  |  |  |
Taxation |  |  |  |
Tax loss carryforwards | 862 |  |  |
2018 |  |  |  |
Taxation |  |  |  |
Tax loss carryforwards | 2,756 |  |  |
2019 |  |  |  |
Taxation |  |  |  |
Tax loss carryforwards | 1,084 |  |  |
2021 |  |  |  |
Taxation |  |  |  |
Tax loss carryforwards | 908 |  |  |
2022 |  |  |  |
Taxation |  |  |  |
Tax loss carryforwards | $ 289 |  |  |

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