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Operations and Reorganization - Liquidity (Details)
¥ in Thousands, $ in Thousands
 1 Months Ended 12 Months Ended
Apr. 30, 2020
shares
Oct. 31, 2018
shares
Apr. 30, 2018
shares
Dec. 31, 2020
CNY (¥)
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2020
USD ($)
Issuance of preferred shares                    
Net losses       ¥ 3,054,017 $ 468,049 ¥ 1,303,570   ¥ 565,021    
Net cash (used in)/provided by operating activities       753,100 115,418 194,551   737,286    
Accumulated deficit       7,175,300   4,145,606   2,842,690   $ 1,099,668
Net proceeds from the offering, after deducting offerings expenses       2,817,458 431,794 1,647,711   4,952,606    
Convertible senior notes (the "2027 Notes") due 2027 [Member]                    
Issuance of preferred shares                    
Net proceeds from the offering, after deducting commissions and offerings expenses       ¥ 5,594,800 $ 786,100          
Class Z Ordinary Shares                    
Issuance of preferred shares                    
Ordinary shares, issued (in shares) 17,310,696 25,063,451 42,000,000              
Proceeds from issuance initial public offering               2,170,800 $ 317,200  
Class Z Ordinary Shares | Convertible senior notes (the "2027 Notes") due 2027 [Member]                    
Issuance of preferred shares                    
Ordinary shares, issued (in shares)       17,310,696 17,310,696          
Net proceeds from the offering, after deducting offerings expenses       ¥ 2,817,500 $ 399,400          
Notes And Primary Offering [Member] | Convertible senior notes (the "2027 Notes") due 2027 [Member]                    
Issuance of preferred shares                    
Proceeds From Issuance Initial Public Offering And Notes Net Of Offering Costs           ¥ 5,003,800 $ 733,900      
IPO [Member]                    
Issuance of preferred shares                    
Proceeds from issuance initial public offering               ¥ 2,781,800 $ 443,300  
IPO [Member] | Class Z Ordinary Shares                    
Issuance of preferred shares                    
Ordinary shares, issued (in shares)     42,000,000         25,063,451 25,063,451