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Share repurchase program (Details) $ / shares in Units, ¥ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2021 CNY (¥) shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2020 CNY (¥) shares	May 06, 2020 shares
Equity, Class of Treasury Stock [Line Items]
Number of shares repurchased	6,646,700	6,646,700	12,996,125	12,996,125
ADS
Equity, Class of Treasury Stock [Line Items]
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

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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

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Number of shares that have been repurchased during the period and are being held in treasury.

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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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