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Convertible loans (Detail Textuals 1)
¥ in Thousands
1 Months Ended
Aug. 01, 2017
CNY (¥)
Notes
Jun. 30, 2018
$ / shares
shares
Dec. 31, 2017
CNY (¥)
Debt Instrument [Line Items]      
Carrying amount of Convertible loans     ¥ 41,165
August 2017 Promissory Notes      
Debt Instrument [Line Items]      
Number of Promissory Notes issued to investors | Notes 4    
Principal amount of convertible loans ¥ 6,300    
Term of debt instrument 9 months    
Interest rate of convertible loans 10.00%    
Debt conversion, description The entire principal amount of the August 2017 Loan shall be converted into Series C-4 convertible redeemable preferred shares issued and sold at the closing of the Series C-4 convertible redeemable preferred shares, at the lower of: (1) US$200 million the post-money valuation at issuance of the Promissory Notes; or (2) the post-money valuation in the Series C-4 convertible redeemable preferred shares.    
Post-money valuation at issuance of Promissory Notes ¥ 200,000    
Carrying amount of Convertible loans     ¥ 41,200
August 2017 Promissory Notes | Series C-4 convertible redeemable preferred shares      
Debt Instrument [Line Items]      
Shares issued in conversion of convertible loans | shares   7,569,628  
Par value of preferred shares | $ / shares   $ 0.0001  
Conversion price of convertible loan | $ / shares   $ 0.8323