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Ordinary shares and treasury shares (Details) $ / shares in Units, ¥ in Thousands |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 15, 2024 shares | Dec. 31, 2024 USD ($) | Dec. 31, 2024 CNY (¥) shares | Dec. 31, 2024 USD ($) $ / shares shares | Dec. 31, 2023 $ / shares | Dec. 31, 2023 CNY (¥) shares | Dec. 31, 2022 shares | Dec. 20, 2022 $ / shares
Ordinary Share |  |  |  |  |  |  |  |
Amount of shares authorized | $ |  | $ 50,000,000 |  |  |  |  |  |
Ordinary shares, shares authorized (in shares) |  |  | 10,000,000,000 | 10,000,000,000 |  |  |  |
Par value per share of shares sold back by four members of the Group's management | $ / shares |  |  |  |  |  |  |  | $ 0.000005
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares to be Repurchased Next Year | 4,500,000 |  |  |  |  |  |  |
Share Repurchase Program, Authorized, Amount | $ |  |  |  | $ 20,000,000 |  |  |  |
Share Repurchase Program, Authorized, Number of Shares |  |  | 503,000 | 503,000 |  |  |  |
Treasury shares, at cost |  |  | ¥ 7,435 | $ 1,019,000 |  | ¥ 0 |  |
Class A Ordinary Shares |  |  |  |  |  |  |  |
Ordinary Share |  |  |  |  |  |  |  |
Ordinary shares, shares authorized (in shares) |  |  | 8,000,000,000 | 8,000,000,000 |  | 8,000,000,000 |  |
Par value per share of shares sold back by four members of the Group's management | $ / shares |  |  |  | $ 0.000005 | $ 0.000005 |  |  |
Ordinary shares, shares issued (in shares) |  |  | 291,166,110 | 291,166,110 |  | 288,989,049 | 288,434,474 |
Ordinary shares, shares outstanding (in shares) |  |  | 291,166,110 | 291,166,110 |  | 288,989,049 |  |
Class A Ordinary Shares | Share Incentive 2022 Plan |  |  |  |  |  |  |  |
Ordinary Share |  |  |  |  |  |  |  |
Ordinary shares, shares issued (in shares) |  |  | 7,180,061 | 7,180,061 |  | 554,575 |  |
Class B Ordinary Shares |  |  |  |  |  |  |  |
Ordinary Share |  |  |  |  |  |  |  |
Ordinary shares, shares authorized (in shares) |  |  | 1,000,000,000 | 1,000,000,000 |  | 1,000,000,000,000 |  |
Par value per share of shares sold back by four members of the Group's management | $ / shares |  |  |  | $ 0.000005 | $ 0.000005 |  |  |
Ordinary shares, shares issued (in shares) |  |  | 48,960,916 | 48,960,916 |  | 48,960,916 |  |
Ordinary shares, shares outstanding (in shares) |  |  | 48,960,916 | 48,960,916 |  | 48,960,916 | 48,960,916 |
Designated Shares |  |  |  |  |  |  |  |
Ordinary Share |  |  |  |  |  |  |  |
Ordinary shares, shares authorized (in shares) |  |  | 1,000,000,000 | 1,000,000,000 |  |  |  |
Par value per share of shares sold back by four members of the Group's management | $ / shares |  |  |  | $ 0.000005 |  |  |  |

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