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Revenue - Contract balance (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2025
CNY (¥)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2025
USD ($)
Revenue          
Contract assets ¥ 0   ¥ 0    
Advance from customers 95,698   46,151   $ 13,685
Revenue recognized ¥ 19,192 $ 2,744 ¥ 28,013 ¥ 61,087