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Taxation - Schedule of current and deferred portion of income tax expenses (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2025
CNY (¥)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
CNY (¥)
Taxation        
Deferred income tax benefits ¥ (4,059) $ (580) ¥ (4,041) ¥ (4,007)
Total income tax expenses 12,806 $ 1,831 13,500 13,215
China        
Taxation        
Current income tax expenses 390   518  
Total income tax expenses 390   518  
Non Prc [Member]        
Taxation        
Current income tax expenses 16,475   17,023 17,222
Deferred income tax benefits (4,059)   (4,041) (4,007)
Total income tax expenses ¥ 12,416   ¥ 12,982 ¥ 13,215