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Related party transactions (Detail Textuals) - CNY (¥)
¥ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Related Party Transaction [Line Items]      
Receivables due from related parties   ¥ 2,260  
Mr. Wei Wen      
Related Party Transaction [Line Items]      
Receivables due from related parties ¥ 1,000   ¥ 1,200
Mr. Xingyu Du      
Related Party Transaction [Line Items]      
Receivables due from related parties ¥ 800 ¥ 1,000