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Cash and restricted cash - Deposits in financial institutions (Details) - CNY (¥) ¥ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Cash and restricted cash |  |
Cash balances held at financial institutions | ¥ 778,341 | ¥ 900,963
Restricted cash pledged for notes payable | 40,957 | 23,004
PRC |  |
Cash and restricted cash |  |
Cash balances held at financial institutions | 730,946 | 849,827
PRC | RMB |  |
Cash and restricted cash |  |
Cash balances held at financial institutions | 472,471 | 667,686
PRC | US |  |
Cash and restricted cash |  |
Cash balances held at financial institutions | 258,475 | 182,141
Hong Kong |  |
Cash and restricted cash |  |
Cash balances held at financial institutions | 9,416 |
Hong Kong | HKD |  |
Cash and restricted cash |  |
Cash balances held at financial institutions | 14 |
Hong Kong | US |  |
Cash and restricted cash |  |
Cash balances held at financial institutions | 9,402 |
Sweden |  |
Cash and restricted cash |  |
Cash balances held at financial institutions | 15,028 | 28,986
Sweden | US |  |
Cash and restricted cash |  |
Cash balances held at financial institutions | 555 |
Sweden | SEK |  |
Cash and restricted cash |  |
Cash balances held at financial institutions | 14,473 | 28,986
United Kingdom |  |
Cash and restricted cash |  |
Cash balances held at financial institutions | 22,934 | 22,150
United Kingdom | GBP |  |
Cash and restricted cash |  |
Cash balances held at financial institutions | 22,934 | ¥ 22,150
United States |  |
Cash and restricted cash |  |
Cash balances held at financial institutions | 17 |
United States | US |  |
Cash and restricted cash |  |
Cash balances held at financial institutions | ¥ 17 |

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- Definition Amount of restricted cash pledged for notes payable. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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