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Loans payable (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Statement [Line Items]    
Loans payable ¥ 171,569 ¥ 172,891
Third parties [Member]    
Statement [Line Items]    
Loans payable 140,558 140,558
Shareholders [Member]    
Statement [Line Items]    
Loans payable 20,000 20,000
Related parties [Member]    
Statement [Line Items]    
Loans payable ¥ 11,011 ¥ 12,333