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Cash and restricted cash - Deposits in financial institutions (Details) ¥ in Thousands, $ in Thousands | Jun. 30, 2024 CNY (¥) | Jun. 30, 2024 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2023 USD ($) | Jun. 30, 2023 CNY (¥) | Dec. 31, 2022 CNY (¥)
--- | --- | --- | --- | --- | --- | ---
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows | ¥ 787,798 | $ 108,405 | ¥ 598,886 | $ 82,409 | ¥ 927,782 | ¥ 901,429
Restricted cash | 159 | $ 22 | 27,126 |  |  |
Asset Pledged as Collateral | Restricted Cash For Notes Payable |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Restricted cash | 159 |  | 3,513 |  |  |
Asset Pledged as Collateral | Restricted Cash For Litigation |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Restricted cash |  |  | 23,613 |  |  |
PRC |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows | 749,447 |  | 542,645 |  |  |
PRC | RMB |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows | 732,805 |  | 528,022 |  |  |
PRC | US |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows | 16,433 |  | 14,542 |  |  |
PRC | GBP |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows | 89 |  | 81 |  |  |
PRC | Euro |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows | 109 |  | 0 |  |  |
PRC | HKD |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows | 11 |  | 0 |  |  |
Hong Kong |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows | 628 |  | 40 |  |  |
Hong Kong | RMB |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows | 27 |  | 27 |  |  |
Hong Kong | HKD |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows | 601 |  | 13 |  |  |
Sweden |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows | 34,949 |  | 39,788 |  |  |
Sweden | US |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows | 207 |  | 204 |  |  |
Sweden | SEK |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows | 34,742 |  | 39,584 |  |  |
United Kingdom |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows | 562 |  | 12,356 |  |  |
United Kingdom | GBP |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows | 562 |  | 12,356 |  |  |
United States |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows | 2,079 |  | 3,867 |  |  |
United States | US |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows | 2,079 |  | 3,867 |  |  |
Germany |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows | 133 |  | 190 |  |  |
Germany | Euro |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows | ¥ 133 |  | ¥ 190 |  |  |

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