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Organization and principal activities (Details 1) - CNY (¥)
¥ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Statement [Line Items]    
Total Current Assets ¥ 556,377 ¥ 663,089
Total Non-current Assets 42,185 45,159
Total Assets 598,562 708,248
Total Current Liabilities 280,259 261,944
VIEs [Member]    
Statement [Line Items]    
Total Current Assets 556,377 663,089
Total Non-current Assets 42,185 45,159
Total Assets 598,562 708,248
Total Current Liabilities 280,259 261,944
Total Liabilities ¥ 280,259 ¥ 261,944