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Revenue - Contract balance (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2023
CNY (¥)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
USD ($)
Revenue            
Contract assets ¥ 0       ¥ 0  
Advance from customers 59,408       ¥ 46,151 $ 6,323
Revenue recognized ¥ 28,013 $ 3,838 ¥ 61,087 ¥ 21,242