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Income taxes - Components of income / (loss) before income taxes (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2024 CNY (¥) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 CNY (¥)
Income taxes |  |  |  |
Income / (loss) before income taxes | ¥ (988,388) | $ (135,408) | ¥ (1,019,138) | ¥ (1,578,081)
The Cayman Islands |  |  |  |
Income taxes |  |  |  |
Income / (loss) before income taxes | (121,803) |  | (53,587) | (57,261)
British Virgin Islands |  |  |  |
Income taxes |  |  |  |
Income / (loss) before income taxes | (5,931) |  | 18,832 | (2)
Hong Kong S.A.R |  |  |  |
Income taxes |  |  |  |
Income / (loss) before income taxes | 52,583 |  | (17,343) | (27,262)
Sweden |  |  |  |
Income taxes |  |  |  |
Income / (loss) before income taxes | 3,181 |  | 13,654 | 7,015
United Kingdom |  |  |  |
Income taxes |  |  |  |
Income / (loss) before income taxes | (186,346) |  | (246,423) | (348,872)
Americas |  |  |  |
Income taxes |  |  |  |
Income / (loss) before income taxes | 5,743 |  | (26,109) | 0
Germany |  |  |  |
Income taxes |  |  |  |
Income / (loss) before income taxes | (25,003) |  | (13,291) | 0
The PRC, excluding Hong Kong S.A.R. |  |  |  |
Income taxes |  |  |  |
Income / (loss) before income taxes | ¥ (710,812) |  | ¥ (694,871) | ¥ (1,151,699)

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