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Preferred shares (Detail Textuals)
¥ in Thousands, $ in Thousands
 1 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
shares
Jun. 30, 2018
USD ($)
shares
Jun. 30, 2017
CNY (¥)
shares
Jun. 30, 2017
USD ($)
shares
Aug. 31, 2014
USD ($)
shares
Sep. 30, 2013
USD ($)
shares
Mar. 31, 2013
USD ($)
shares
Dec. 31, 2018
CNY (¥)
director
shares
Dec. 31, 2018
USD ($)
director
shares
Temporary Equity [Line Items]                  
Principal amount of convertible loans | ¥               ¥ 930,436  
Percentage of amount received inclueds preferred share purchase price, plus all declared but unpaid dividend in case of dissolution or winding up of the Company or sale of shares, merger, consolidation or other similar transaction               100.00% 100.00%
Number of director appointed by ordinary shareholders | director               3 3
Group of investors                  
Temporary Equity [Line Items]                  
Proceeds from share issued | $                 $ 125,100
K2 Evergreen Partners L.P. and K2 Partners II L.P. jointly right                  
Temporary Equity [Line Items]                  
Number of director appointed by ordinary shareholders | director               1 1
BAI GmbH has the right to appoint one director; Highland Capital Partners 9 L.P., Highland Capital Partners 9-B L.P. and Highland Entrepreneurs? Fund 9 L.P. jointly right                  
Temporary Equity [Line Items]                  
Number of director appointed by ordinary shareholders | director               1 1
AlphaX Partners Fund I, L.P., and Beijing Z-Park Fund jointly right                  
Temporary Equity [Line Items]                  
Number of director appointed by ordinary shareholders | director               1 1
Series B-1 preferred shares                  
Temporary Equity [Line Items]                  
Conversion ratio of preferred shares converted in to ordinary shares               11 11
Preferred share redemption right               For Series B-1 and B-2 preferred shares, they can be redeemed at any time after the fifth (5th) anniversary of the Series B-1 and B-2 preferred shares issue date For Series B-1 and B-2 preferred shares, they can be redeemed at any time after the fifth (5th) anniversary of the Series B-1 and B-2 preferred shares issue date
Percentage of interest on original issue price               10.00% 10.00%
Series B-2 preferred shares                  
Temporary Equity [Line Items]                  
Conversion ratio of preferred shares converted in to ordinary shares               11 11
Preferred share redemption right               For Series B-1 and B-2 preferred shares, they can be redeemed at any time after the fifth (5th) anniversary of the Series B-1 and B-2 preferred shares issue date For Series B-1 and B-2 preferred shares, they can be redeemed at any time after the fifth (5th) anniversary of the Series B-1 and B-2 preferred shares issue date
Percentage of interest on original issue price               10.00% 10.00%
Series C-1 preferred shares                  
Temporary Equity [Line Items]                  
Conversion ratio of preferred shares converted in to ordinary shares               11 11
Preferred share redemption right               For Series C-1 and C-2 preferred shares, they can be redeemed at any time after the fifth (5th) anniversary of the Series C-1 and C-2 preferred shares issue date For Series C-1 and C-2 preferred shares, they can be redeemed at any time after the fifth (5th) anniversary of the Series C-1 and C-2 preferred shares issue date
Percentage of interest on original issue price               8.00% 8.00%
Series C-2 preferred shares                  
Temporary Equity [Line Items]                  
Conversion ratio of preferred shares converted in to ordinary shares               11 11
Preferred share redemption right               For Series C-1 and C-2 preferred shares, they can be redeemed at any time after the fifth (5th) anniversary of the Series C-1 and C-2 preferred shares issue date For Series C-1 and C-2 preferred shares, they can be redeemed at any time after the fifth (5th) anniversary of the Series C-1 and C-2 preferred shares issue date
Percentage of interest on original issue price               8.00% 8.00%
Series A financing                  
Temporary Equity [Line Items]                  
Proceeds from share issued | $             $ 700,000    
Series A financing | China Best                  
Temporary Equity [Line Items]                  
Proceeds from share issued | ¥               ¥ 1,260,000  
Shares Issued               5,660,000 5,660,000
Conversion ratio of preferred shares converted in to ordinary shares               11 11
Preferred share redemption right               For China Best and Series A preferred shares, they can be redeemed at any time after the sixth (6th) anniversary of the China Best and Series A Preferred Shares issue date For China Best and Series A preferred shares, they can be redeemed at any time after the sixth (6th) anniversary of the China Best and Series A Preferred Shares issue date
Percentage of interest on original issue price               10.00% 10.00%
Series A financing | K2 Evergreen Partner L.P.                  
Temporary Equity [Line Items]                  
Shares Issued             2,828,393    
Series A financing | K2 Partners II L.P.                  
Temporary Equity [Line Items]                  
Shares Issued             16,970,357    
Series B financing                  
Temporary Equity [Line Items]                  
Proceeds from share issued | $           $ 5,564,856      
Series B financing | Series B-1 preferred shares | K2 Evergreen Partner L.P.                  
Temporary Equity [Line Items]                  
Shares Issued           4,142,781      
Series B financing | Series B-1 preferred shares | K2 Partners II L.P.                  
Temporary Equity [Line Items]                  
Shares Issued           8,285,562      
Series B financing | Series B-2 preferred shares | K2 Partners II L.P.                  
Temporary Equity [Line Items]                  
Shares Issued           4,548,443      
Series B financing | Series B-2 preferred shares | BAI GmbH                  
Temporary Equity [Line Items]                  
Shares Issued           18,193,772      
Series C financing                  
Temporary Equity [Line Items]                  
Proceeds from share issued | $         $ 23,658,593        
Series C financing | Series C-1 preferred shares | BAI GmbH                  
Temporary Equity [Line Items]                  
Shares Issued         3,427,812        
Series C financing | Series C-2 preferred shares | BAI GmbH                  
Temporary Equity [Line Items]                  
Shares Issued         5,643,437        
Series C financing | Series C-2 preferred shares | Highland Capital Partners 9 Limited Partnership                  
Temporary Equity [Line Items]                  
Shares Issued         18,290,377        
Series C financing | Series C-2 preferred shares | Highland Capital Partners 9-B Limited Partnership                  
Temporary Equity [Line Items]                  
Shares Issued         7,878,398        
Series C financing | Series C-2 preferred shares | Highland Entrepreneurs? Fund 9 Limited Partnership                  
Temporary Equity [Line Items]                  
Shares Issued         1,596,503        
Series C+ financing                  
Temporary Equity [Line Items]                  
Proceeds from share issued | $       $ 8,682,770          
Conversion ratio of preferred shares converted in to ordinary shares               11 11
Preferred share redemption right               For Series C+ preferred shares, they can be redeemed at any time after the fifth (5th) anniversary of the Series C+ preferred shares issue date For Series C+ preferred shares, they can be redeemed at any time after the fifth (5th) anniversary of the Series C+ preferred shares issue date
Percentage of interest on original issue price               8.00% 8.00%
Series C+ financing | K2 Partners II L.P.                  
Temporary Equity [Line Items]                  
Shares Issued     2,175,611 2,175,611          
Series C+ financing | K2 Family Partners Limited                  
Temporary Equity [Line Items]                  
Shares Issued     725,204 725,204          
Series C+ financing | BAI GmbH                  
Temporary Equity [Line Items]                  
Shares Issued     1,450,408 1,450,408          
Series C+ financing | Highland Capital Partners 9 Limited Partnership                  
Temporary Equity [Line Items]                  
Shares Issued     1,910,912 1,910,912          
Series C+ financing | Highland Capital Partners 9-B Limited Partnership                  
Temporary Equity [Line Items]                  
Shares Issued     823,106 823,106          
Series C+ financing | Highland Entrepreneurs? Fund 9 Limited Partnership                  
Temporary Equity [Line Items]                  
Shares Issued     166,797 166,797          
Series C+ financing | AlphaX Partners Fund I, L.P.                  
Temporary Equity [Line Items]                  
Shares Issued     5,341,517 5,341,517          
Series C+ financing | Puhua                  
Temporary Equity [Line Items]                  
Principal amount of convertible loans | ¥     ¥ 30,000            
Number of shares issued for conversion of convertible loan     6,261,743 6,261,743          
Series C-4 financing                  
Temporary Equity [Line Items]                  
Principal amount of convertible loans | $   $ 6,300              
Number of shares issued for conversion of convertible loan   7,569,628              
Conversion ratio of preferred shares converted in to ordinary shares               11 11
Preferred share redemption right               For Series C-4 preferred shares, they can be redeemed at any time after the third (3rd) anniversary of the Series C-4 preferred shares issue date For Series C-4 preferred shares, they can be redeemed at any time after the third (3rd) anniversary of the Series C-4 preferred shares issue date
Percentage of interest on original issue price               10.00% 10.00%
Series D-1 financing                  
Temporary Equity [Line Items]                  
Proceeds from share issued | $   $ 23,350,000              
Conversion ratio of preferred shares converted in to ordinary shares               11 11
Preferred share redemption right               For Series D-1 preferred shares, they can be redeemed at any time after the third (3rd) anniversary of the Series D-1 preferred shares issue date For Series D-1 preferred shares, they can be redeemed at any time after the third (3rd) anniversary of the Series D-1 preferred shares issue date
Percentage of interest on original issue price               10.00% 10.00%
Series D-1 financing | ACEE Capital Ltd.                  
Temporary Equity [Line Items]                  
Shares Issued   3,592,664              
Series D-1 financing | Honour Depot Limited                  
Temporary Equity [Line Items]                  
Shares Issued   6,453,887              
Series D-2 financing                  
Temporary Equity [Line Items]                  
Conversion ratio of preferred shares converted in to ordinary shares               11 11
Preferred share redemption right               For Series D-2 preferred shares, they can be redeemed at any time after the third (3rd) anniversary of the Series D-2 preferred shares issue date For Series D-2 preferred shares, they can be redeemed at any time after the third (3rd) anniversary of the Series D-2 preferred shares issue date
Percentage of interest on original issue price               10.00% 10.00%
Series D-2 financing | Beijing Z-Park Fund                  
Temporary Equity [Line Items]                  
Proceeds from share issued | $ $ 50,000                
Shares Issued 20,630,925