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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2022
Summary of Option Activity
 
The following table summarizes the option activity for the year ended December 31, 2022:
 
     Number of
options		      Weighted
average
exercise price
per option
(US$)		      Weighted average
remaining
contractual life
(years)		      Aggregated intrinsic
Value
(US$)		  
Outstanding as of December 31, 2021
      29,676,253        0.0157        6.69        132,783  
    
 
 
     
 
 
     
 
 
     
 
 
  
Granted
      5,601,640        0.0002                    
Exercised
      (5,622,274 )       0.0039                    
Forfeited
      (1,410,996 )       0.0011                    
    
 
 
     
 
 
     
 
 
     
 
 
  
Outstanding as of December 31, 2022
      28,244,623        0.0157        6.40        126,375  
    
 
 
     
 
 
     
 
 
     
 
 
  
Exercisable as of December 31, 2022
      16,636,567        0.0265        4.78        74,260  
Schedule of Assumptions Used to Estimate Fair Value of Stock Options Granted
The fair value of options granted was estimated on the date of grant using the Black-Sholes pricing model with the following assumptions used for grants during the applicable periods:
 
    
Risk-free interest

rate of return		      Expected term      Volatility      Dividend yield      Exercise price
(US$)		  
2020
      1.22%~1.48%        6 years        50.6%~54.4%        —          0.0002  
2021
      1.64%~1.96%        6 years        50.2%~51.8%        —          0.0002  
2022
      2.20%~4.86%        6 years        50.3%~57.8%        —          0.0002  
Options classified as Equity Awards  
Summary of Option Activity
The following table summarizes the option activity for the year ended December 31, 2022:
 
     Number of
options		      Weighted
average exercise
price per option		      Weighted average
remaining
contractual life		      Aggregated
intrinsic Value		  
            (US$)      (years)      (US$)  
Outstanding as of December 31, 2021
      4,848,671        1.6232        6.76        —    
    
 
 
     
 
 
     
 
 
     
 
 
  
Granted
      926,300        0.0001                    
Repurchased
      (769,889 )       1.0237                    
Forfeited
      (384,066 )       0.8650                    
    
 
 
     
 
 
     
 
 
     
 
 
  
Outstanding as of December 31, 2022
      4,621,016        1.4607        6.58        —    
    
 
 
     
 
 
     
 
 
     
 
 
  
Exercisable as of December 31, 2022
      3,002,020        2.1096        5.20        —    
Schedule of Assumptions Used to Estimate Fair Value of Stock Options Granted
The fair value of each option granted was estimated on the date of grant using the binomial tree pricing model with the following assumptions used for grants during the applicable periods:
 
     Risk-free interest
rate of return		      Contractual term      Volatility      Dividend yield      Exercise price
(US$)		  
2020
      1.52%~1.83%        10 years        53.8%~57.1%        —          0.002~5.0  
2021
      2.04%~2.04%        10 years        59.0%~59.0%        —          0.002~5.0  
2022
      4.40%~4.40%        10 years        56.2%~56.2%        —          0.0001