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Organization and principal activities (Details 1) - CNY (¥)
¥ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Statement [Line Items]    
Total Current Assets ¥ 24,563 ¥ 202,344
Total Non-current Assets 46,295 81,172
Total Assets 70,858 283,516
Total Liabilities 42,809 334,671
VIEs [Member]    
Statement [Line Items]    
Total Current Assets 0 194,526
Total Non-current Assets 0 36,329
Total Assets 0 230,855
Total Current Liabilities 0 316,162
Total Liabilities ¥ 0 ¥ 316,162