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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, 2022 CNY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2020 CNY (¥)
Income taxes |  |  |  |
Income / (loss) before income taxes | ¥ (1,519,638) | $ (220,327) | ¥ (1,181,985) | ¥ (439,776)
The Cayman Islands |  |  |  |
Income taxes |  |  |  |
Income / (loss) before income taxes | (57,261) |  | (4,811) | 55,644
British Virgin Islands |  |  |  |
Income taxes |  |  |  |
Income / (loss) before income taxes | (2) |  |  |
Hong Kong S.A.R |  |  |  |
Income taxes |  |  |  |
Income / (loss) before income taxes | (27,262) |  | (53,347) | 93
Sweden |  |  |  |
Income taxes |  |  |  |
Income / (loss) before income taxes | 7,015 |  | (310) |
United Kingdom |  |  |  |
Income taxes |  |  |  |
Income / (loss) before income taxes | (348,872) |  | (11,164) |
The PRC, excluding Hong Kong S.A.R |  |  |  |
Income taxes |  |  |  |
Income / (loss) before income taxes | ¥ (1,093,256) |  | ¥ (1,112,353) | ¥ (495,513)

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