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Restricted cash (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2025
CNY (¥)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
CNY (¥)
Restricted cash.      
Restricted cash ¥ 12,031 $ 1,720 ¥ 17,031
Additional amount subject to potential restriction ¥ 20,000