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Cash and restricted cash - Deposits in financial institutions (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2023 CNY (¥) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2020 CNY (¥)
--- | --- | --- | --- | --- | --- | ---
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows | ¥ 588,274 | $ 82,857 | ¥ 901,429 | $ 126,964 | ¥ 989,132 | ¥ 1,003,876
Restricted cash | 27,126 | $ 3,821 | 40,957 |  |  |
stricted Cash For Litigation |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Restricted cash | 23,613 |  |  |  |  |
Asset Pledged as Collateral | Restricted Cash For Notes Payable |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Restricted cash | 3,513 |  | 40,957 |  |  |
PRC |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows | 542,645 |  | 854,034 |  |  |
PRC | RMB |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows | 528,022 |  | 595,559 |  |  |
PRC | US |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows | 14,542 |  | 258,475 |  |  |
PRC | GBP |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows | 81 |  | 0 |  |  |
Hong Kong |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows | 40 |  | 9,416 |  |  |
Hong Kong | RMB |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows | 27 |  | 0 |  |  |
Hong Kong | US |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows | 0 |  | 9,402 |  |  |
Hong Kong | HKD |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows | 13 |  | 14 |  |  |
Sweden |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows | 29,176 |  | 15,028 |  |  |
Sweden | US |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows | 204 |  | 555 |  |  |
Sweden | SEK |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows | 28,972 |  | 14,473 |  |  |
United Kingdom |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows | 12,356 |  | 22,934 |  |  |
United Kingdom | GBP |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows | 12,356 |  | 22,934 |  |  |
United States |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows | 3,867 |  | 17 |  |  |
United States | US |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows | 3,867 |  | 17 |  |  |
Germany |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows | 190 |  | 0 |  |  |
Germany | Euro |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows | ¥ 190 |  | ¥ 0 |  |  |

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