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Summary of Significant Accounting Policies (Tables)
9 Months Ended
Sep. 30, 2020
Accounting Policies [Abstract]  
Schedule of disaggregation of revenue For the nine months ended September 30, 2019 and 2020, substantially all of the Group’s net revenues were generated in the PRC. The following table provides information about disaggregated revenue by types:
 
    
For the nine months ended
September 30,
 
    
2019
    
2020
 
    
RMB
    
RMB
 
Learning services
  
 
454,980
 
  
 
1,423,025
 
    
 
 
    
 
 
 
Online courses services
     391,622        1,317,440  
Fee-based
premium services
     63,358        105,585  
Online marketing services
  
 
354,494
 
  
 
335,047
 
Learning products
  
 
84,977
 
  
 
302,647
 
    
 
 
    
 
 
 
Total net revenues
  
 
894,451
 
  
 
2,060,719