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Advances from customers and deferred revenue (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2025
CNY (¥)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
CNY (¥)
Advances from customers and deferred revenue      
Deferred revenue, current ¥ 222,724   ¥ 263,603
Advances from customers 5,443   2,025
Total current advances from customers and deferred revenue 228,167 $ 32,627 265,628
Deferred revenue, non-current 31,824   35,786
Total non-current deferred revenue ¥ 31,824 $ 4,551 ¥ 35,786