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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