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Parent only financial information - Condensed statements of cash flows (Details) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2023 CNY (¥) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2021 CNY (¥)
Condensed statements of cash flows |  |  |  |
Net cash used in operating activities | ¥ (1,243,406) | $ (175,129) | ¥ (461,337) | ¥ (907,283)
Net cash used in investing activities | 592,083 | 83,393 | (313,039) | (1,198,234)
Net cash provided by financing activities | 296,826 | 41,808 | 657,767 | 2,122,792
Effect of foreign currency exchange rate changes on cash and restricted cash | 41,342 | 5,821 | 28,906 | (32,019)
Net decrease in cash and restricted cash | (313,155) | (44,107) | (87,703) | (14,744)
Cash and restricted cash at the beginning of the year | 901,429 | 126,964 | 989,132 | 1,003,876
Cash and restricted cash at the end of the year | 588,274 | $ 82,857 | 901,429 | 989,132
Parent company |  |  |  |
Condensed statements of cash flows |  |  |  |
Net cash used in operating activities | (43,242) |  | (22,893) | (22,741)
Net cash used in investing activities | (123,944) |  | (734,299) | (3,121,321)
Net cash provided by financing activities | 59,177 |  | 729,767 | 3,222,206
Effect of foreign currency exchange rate changes on cash and restricted cash | 1,934 |  | (12,308) | (17,660)
Net decrease in cash and restricted cash | (106,075) |  | (39,733) | 60,484
Cash and restricted cash at the beginning of the year | 119,022 |  | 158,755 | 98,271
Cash and restricted cash at the end of the year | ¥ 12,947 |  | ¥ 119,022 | ¥ 158,755

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