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Revenue information - Schedule of contract liabilities (Details) ¥ in Thousands, $ in Thousands | Jun. 30, 2024 CNY (¥) | Jun. 30, 2024 USD ($) | Dec. 31, 2023 CNY (¥)
--- | --- | --- | ---
Related party balances and transactions |  |  |
Contract liabilities, current and non-current | ¥ 283,235 |  | ¥ 341,633
Nonrelated Party |  |  |
Related party balances and transactions |  |  |
Contract liabilities, current | 1,517 | $ 209 | 621
Contract liabilities, non-current | 6 | 1 | 2
Related Party |  |  |
Related party balances and transactions |  |  |
Contract liabilities, current | 202,919 | 27,923 | 207,017
Contract liabilities, non-current | ¥ 78,793 | $ 10,842 | ¥ 133,993

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