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Ordinary Shares (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Jul. 26, 2018
USD ($)
shares
Jul. 26, 2018
CNY (¥)
shares
Dec. 31, 2018
shares
Dec. 31, 2017
shares
Number of ordinary shares issued     366,943,308  
IPO        
Total Proceeds, net of issuance cost $ 1,690,696 ¥ 11,523,631    
ADSs | IPO        
Number of ordinary shares issued 85,600,000 85,600,000    
Class A ordinary shares        
Shares issued     2,381,240,988 42,486,360
Class A ordinary shares | IPO        
Number of ordinary shares issued 342,400,000 342,400,000