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Notes receivable (Details)
¥ in Thousands, $ in Thousands
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Notes receivable ¥ 16,817 $ 2,304 ¥ 54,634
Asset Pledged as Collateral      
Financial Instruments Owned and Pledged as Collateral [Line Items]      
Notes receivable ¥ 0   ¥ 6,603