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Cash and restricted cash - Deposits in financial institutions (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2024 USD ($) | Dec. 31, 2024 CNY (¥) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 CNY (¥) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2021 CNY (¥)
--- | --- | --- | --- | --- | --- | ---
Cash and restricted cash |  |  |  |  |  |
Restricted cash | $ 5,948 | ¥ 43,416 |  | ¥ 27,126 |  |
Cash and restricted cash shown in the consolidated statements of cash flows | $ 50,341 | 367,452 | $ 82,047 | 598,886 | ¥ 901,429 | ¥ 989,132
Restricted Cash For Litigation |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Restricted cash |  | 800 |  | 23,613 |  |
Asset Pledged as Collateral | Restricted Cash For Notes Payable |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Restricted cash |  | 42,616 |  | 3,513 |  |
PRC |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows |  | 306,268 |  | 542,645 |  |
PRC | RMB |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows |  | 218,313 |  | 528,022 |  |
PRC | US |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows |  | 87,855 |  | 14,542 |  |
PRC | GBP |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows |  | 89 |  | 81 |  |
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 |  | 1,512 |  | 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 |  | 1,485 |  | 13 |  |
Sweden |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows |  | 54,345 |  | 39,788 |  |
Sweden | US |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows |  | 213 |  | 204 |  |
Sweden | SEK |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows |  | 37,651 |  | 39,584 |  |
Sweden | Euro |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows |  | 16,481 |  | 0 |  |
United Kingdom |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows |  | 4,830 |  | 12,356 |  |
United Kingdom | GBP |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows |  | 4,830 |  | 12,356 |  |
United States |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows |  | 218 |  | 3,867 |  |
United States | US |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows |  | 218 |  | 3,867 |  |
Germany |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows |  | 279 |  | 190 |  |
Germany | Euro |  |  |  |  |  |
Cash and restricted cash |  |  |  |  |  |
Cash and restricted cash shown in the consolidated statements of cash flows |  | ¥ 279 |  | ¥ 190 |  |

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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-8 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 24 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-24 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-4 + Details
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