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Organization and principal activities (Details 1) - CNY (¥)
¥ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Statement [Line Items]    
Total Current Assets ¥ 561,036 ¥ 556,377
Total Non-current Assets 39,233 42,185
Total Assets 600,269 598,562
Total Current Liabilities 312,111 280,259
VIEs [Member]    
Statement [Line Items]    
Total Current Assets 556,757 555,478
Total Non-current Assets 39,233 42,185
Total Assets 595,990 597,663
Total Current Liabilities 297,829 274,213
Total Liabilities ¥ 297,829 ¥ 274,213