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Business acquisition - Additional Information (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2022
CNY (¥)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2019
CNY (¥)
Business acquisition.            
Goodwill ¥ 114,661 ¥ 232,007 ¥ 232,007 $ 16,624 $ 33,638  
Contingent consideration paid for business acquisitions   0 14,019      
Unpaid consideration 4,100          
2019 Travel Agencies [Member]            
Business acquisition.            
Goodwill           ¥ 232,007
Contingent consideration paid for business acquisitions 0   14,019      
Downward adjustment of contingent consideration ¥ 3,053 ¥ 3,597 ¥ 5,451