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Ordinary shares (Details)
$ / shares in Units, ¥ in Thousands, $ in Thousands
1 Months Ended
May 31, 2019
shares
Jun. 30, 2018
CNY (¥)
shares
Jun. 30, 2018
USD ($)
shares
Jun. 30, 2016
shares
May 31, 2014
shares
Mar. 31, 2014
shares
Sep. 30, 2019
$ / shares
shares
Dec. 31, 2018
$ / shares
shares
Ordinary shares                
Ordinary shares, par value (in dollars per share) | $ / shares             $ 0.00002 $ 0.00002
RSUs and share options                
Ordinary shares                
Ordinary shares reserved for issuance             137,932,286 160,323,374
Ordinary shares | Huang River Investment Limited | Transaction with Tencent                
Ordinary shares                
Shares Issued           351,678,637    
Class A ordinary shares | IPO                
Ordinary shares                
Shares Issued         166,120,400      
Class A ordinary shares | Huang River Investment Limited                
Ordinary shares                
Shares Issued 8,127,302              
Class A ordinary shares | Huang River Investment Limited | Private Placement                
Ordinary shares                
Shares Issued         139,493,960      
Class A ordinary shares | Newheight Holdings Ltd | Transaction with Walmart                
Ordinary shares                
Shares Issued       144,952,250        
Class A ordinary shares | Google LLC                
Ordinary shares                
Shares Issued   27,106,948 27,106,948          
Consideration received after deducting financing charges   ¥ 3,531,870 $ 549,836