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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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The number of shares represented by one depositary receipt.

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Number of shares authorized to be purchased under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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