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Redeemable Convertible Preferred Shares - Movements in Redeemable Convertible Preferred Shares (Details) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Movements in Redeemable Convertible Preferred Shares      
Balance at the beginning of the period ¥ 2,743,144 ¥ 2,357,079 ¥ 2,278,046
Redemption value accretion 116,308 248,186 228,468
Foreign currency translation adjustment 73,634 137,879 (149,435)
Conversion of Redeemable Convertible Preferred Shares to Class A Ordinary Shares (2,933,086)    
Balance at the end of the period   2,743,144 2,357,079
Series A-2 Redeemable Convertible Preferred Shares      
Movements in Redeemable Convertible Preferred Shares      
Balance at the beginning of the period 102,743 89,814 88,300
Redemption value accretion 3,041 7,735 7,250
Foreign currency translation adjustment 2,747 5,194 (5,736)
Conversion of Redeemable Convertible Preferred Shares to Class A Ordinary Shares (108,531)    
Balance at the end of the period   102,743 89,814
Series B Redeemable Convertible Preferred Shares      
Movements in Redeemable Convertible Preferred Shares      
Balance at the beginning of the period 446,889 390,651 384,068
Redemption value accretion 15,642 33,646 31,532
Foreign currency translation adjustment 11,870 22,592 (24,949)
Conversion of Redeemable Convertible Preferred Shares to Class A Ordinary Shares (474,401)    
Balance at the end of the period   446,889 390,651
Series C Redeemable Convertible Preferred Shares      
Movements in Redeemable Convertible Preferred Shares      
Balance at the beginning of the period 2,193,512 1,876,614 1,805,678
Redemption value accretion 97,625 206,805 189,686
Foreign currency translation adjustment 59,017 110,093 (118,750)
Conversion of Redeemable Convertible Preferred Shares to Class A Ordinary Shares ¥ (2,350,154)    
Balance at the end of the period   ¥ 2,193,512 ¥ 1,876,614