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Summary of significant accounting policies - Goodwill and other intangible assets, net, Advertising (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Goodwill |  |
Impairment losses on intangible assets | $ 0 | $ 0
Maximum |  |
Goodwill |  |
Finite useful life of intangible assets | 10 years |

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