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Property and Equipment, Net (Tables)
12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Summary of Property and equipment, net
    
December 31,

2018
    
December 31,

2019
    
December 31,

2020
 
    
RMB in thousands
 
Leasehold improvements
     51,186        76,772        118,581  
Servers and computers
     481,695        765,110        1,286,310  
Others
     19,127        23,211        30,750  
    
 
 
    
 
 
    
 
 
 
Total
  
 
552,008
 
  
 
865,093
 
  
 
1,435,641
 
Less: accumulated depreciation
     (157,110      (349,006      (673,700
    
 
 
    
 
 
    
 
 
 
Net book value
  
 
394,898
 
  
 
516,087
 
  
 
761,941