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Leases - non-cancelable operating lease agreement (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Supplemental information related to operating leases    
Operating lease right-of-use asset ¥ 18,606 ¥ 34,454
Operating lease liabilities-current (7,860) (8,953)
Operating lease liabilities-non-current (11,743) (26,826)
Total operating lease liabilities ¥ (19,603) ¥ (35,779)
Weighted average remaining lease term 2 years 1 month 28 days 4 years 4 months 2 days
Weighted average discount rate 4.75% 4.75%