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Concentration and risks (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Concentration and risks        
Cash and cash equivalents and restricted cash ¥ 1,250,372 ¥ 2,005,856 ¥ 1,126,920 ¥ 2,438,131
Currency convertibility risk | Cash and cash equivalents and restricted cash | Denominated in RMB        
Concentration and risks        
Cash and cash equivalents and restricted cash ¥ 897,896 ¥ 1,076,036    
Concentration risk (as a percent) 71.81% 53.64%