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Statutory reserves, restricted net assets and parent company only condensed financial information - Condensed statement of cash flows (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Condensed statement of cash flows |  |  |
Net cash used in operating activities | ¥ (567,948) | ¥ (504,203) | ¥ (1,382,752)
Net cash used in investing activities | (908,302) | (37,040) | (94,395)
Net cash provided by financing activities | 715,724 | 1,302,710 | 174,631
Effect of exchange rate changes on cash, cash equivalents, and restricted cash | 5,042 | 117,469 | (8,695)
(Decrease)/Increase in cash, cash equivalents, and restricted cash | (755,484) | 878,936 | (1,311,211)
Cash, cash equivalents, and restricted cash at beginning of year | 2,005,856 | 1,126,920 | 2,438,131
Cash, cash equivalents, and restricted cash at end of year | 1,250,372 | 2,005,856 | ¥ 1,126,920
Parent company | Reportable legal entities |  |  |
Condensed statement of cash flows |  |  |
Net cash used in operating activities | (77) | (277) |
Net cash used in investing activities | (402,789) | (5,559,727) |
Net cash provided by financing activities | 407,581 | 5,560,594 |
Effect of exchange rate changes on cash, cash equivalents, and restricted cash | (2,950) | 26 |
(Decrease)/Increase in cash, cash equivalents, and restricted cash | 1,765 | 616 |
Cash, cash equivalents, and restricted cash at beginning of year | 616 |  |
Cash, cash equivalents, and restricted cash at end of year | ¥ 2,381 | ¥ 616 |

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