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Organization and principal activities (Details 1) - CNY (¥)
¥ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Statement [Line Items]    
Total Current Assets ¥ 202,344 ¥ 561,036
Total Non-current Assets 81,172 39,233
Total Assets 283,516 600,269
Total Current Liabilities 334,671 312,111
VIEs [Member]    
Statement [Line Items]    
Total Current Assets 194,526 556,757
Total Non-current Assets 36,329 39,233
Total Assets 230,855 595,990
Total Current Liabilities 316,162 297,829
Total Liabilities ¥ 316,162 ¥ 297,829