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Subsequent Events (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Feb. 28, 2019
USD ($)
shares
Feb. 28, 2019
CNY (¥)
shares
Dec. 31, 2018
shares
Dec. 31, 2017
shares
Subsequent Events        
Number of ordinary shares issued     366,943,308  
Class A ordinary shares        
Subsequent Events        
Shares issued     2,381,240,988 42,486,360
Subsequent Events | Follow-on public offering        
Subsequent Events        
Total Proceeds, net of issuance cost $ 1,180,080 ¥ 8,113,640    
Subsequent Events | ADSs | Follow-on public offering        
Subsequent Events        
Number of ordinary shares issued 48,435,000 48,435,000    
Subsequent Events | Class A ordinary shares | Follow-on public offering        
Subsequent Events        
Number of ordinary shares issued 193,740,000 193,740,000