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Short-term Investments (Tables)
12 Months Ended
Dec. 31, 2020
Short-term Investments [Abstract]  
Summary of short-term investments
    
December 31,

2018
    
December 31,

2019
    
December 31,

2020
 
    
RMB in thousands
 
Financial products
     858,021        1,070,113        2,866,643  
Investments in publicly traded companies
     —          80,918        434,609  
Money market funds
     87,317        109,779        55,937  
    
 
 
    
 
 
    
 
 
 
Total
  
 
945,338
 
  
 
1,260,810
 
  
 
3,357,189