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Loans payable (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Statement [Line Items]    
Loans payable ¥ 172,891 ¥ 200,417
Third parties [Member]    
Statement [Line Items]    
Loans payable 140,558 110,917
Shareholders [Member]    
Statement [Line Items]    
Loans payable 20,000 10,000
Related parties [Member]    
Statement [Line Items]    
Loans payable ¥ 12,333 ¥ 79,500