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Share repurchase program (Details) $ / shares in Units, ¥ in Millions, $ in Millions | 12 Months Ended | 36 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2021 CNY (¥) shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2020 CNY (¥) shares | Dec. 31, 2024 shares | Oct. 03, 2024 | Oct. 02, 2024 | May 06, 2020 shares
Share repurchase program |  |  |  |  |  |  |  |
Number of shares repurchased | 6,646,700 | 6,646,700 | 12,996,125 | 12,996,125 | 0 |  |  |
Treasury shares exercised |  |  |  |  | 19,027,882 |  |  |
Treasury shares repurchase program |  |  |  |  | 614,943 |  |  |
ADS |  |  |  |  |  |  |  |
Share repurchase program |  |  |  |  |  |  |  |
Number of shares authorized to repurchase |  |  |  |  |  |  |  | 1,000,000
Number of shares repurchased | 265,868 | 265,868 | 519,845 | 519,845 |  |  |  |
Payments for repurchase of shares | $ 0.9 | ¥ 5.8 | $ 1.7 | ¥ 11.7 |  |  |  |
Weighted average price | $ / shares | $ 3.3 |  | $ 3.3 |  |  |  |  |
Class A Ordinary Shares |  |  |  |  |  |  |  |
Share repurchase program |  |  |  |  |  |  |  |
Ratio of ADSs to Class A ordinary shares |  |  |  |  |  | 500 | 25 | 25

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