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Ordinary shares (Details)
$ / shares in Units, ¥ in Thousands, $ in Thousands
1 Months Ended
Jun. 30, 2018
USD ($)
shares
Jun. 30, 2018
CNY (¥)
shares
Jun. 30, 2016
shares
May 31, 2014
shares
Mar. 31, 2014
shares
Dec. 31, 2018
$ / shares
shares
Dec. 31, 2017
$ / 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           160,323,374 149,369,486
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 | 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 $ 549,836 ¥ 3,531,870