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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Company Share Incentive Plan [Member]  
Summary of Option Activity
The following table summarizes the option activity for the year ended December 31, 201
9
:
 
Number of
options
   
Weighted
average
exercise price
per option
(US$)
   
Weighted average
remaining
contractual life
(years)
   
Aggregated intrinsic
Value
(US$)
 
Outstanding as of January 1, 201
9
    
21,783,103
      
0.0296
      
7.36
      
258,030
  
Granted
   
5,820,796
      
0.0002
     
     
 
Exercised
   
(3,290,330
 )    
0.0082
      
     
 
Forfeited
   
(515,862
 )    
0.0002
     
     
 
Outstanding as of December 31, 201
9
    
23,797,707
      
0.0260
      
7.05
      
397,993
  
Exercisable as of December 31, 201
9
    
12,180,915
      
0.0506
      
5.58
      
203,414
  
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 after the Company completed its
initial public offering
, 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$)
 
2017
   
2.47%~2.87
 %    
6 years
     
50.7%~54.0
 %    
—
      
0.0002
 
2018
   
3.16%~3.66
 %    
6 years
     
50.0%~50.7
 %    
—
      
0.0002
 
2019
   
2.45%~3.21
%
    
6 years
      
49.0%~50.5
%
    
—
      
0.0002
  
Options classified as Equity Awards | 2018 Plan  
Summary of Option Activity
The following table summarizes the option activity for the year ended December 31, 2019:
 
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, 2018
    
9,482,930
      
1.4309
      
7.45
      
35,666
  
                                 
Granted
   
3,414,378
      
3.8135
      
     
 
Redeemed
    
(170,118
)
    
0.1796
      
     
 
Forfeited
   
(802,107
 )    
1.1616
      
     
 
                                 
Outstanding as of December 31, 2019
    
11,925,083
      
2.1490
      
7.40
      
34,356
  
                                 
Exercisable as of December 31, 2019
    
4,797,434
      
1.0284
      
6.18
      
19,197
  
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$)
 
During the year ended December 31, 2018
   
3.58
 %    
10 years
     
55.4
 %    
—
      
0.32
~
5.0
 
During the year ended December 31, 2019
 
 
2.30%~3.50
%
 
 
10 years
 
 
 
54.2%~55.4
%
 
 
—
 
 
 
0.32~5.0
 
Options classified as Liability Awards | 2018 Plan  
Schedule of Assumptions Used to Estimate Fair Value of Stock Options Granted
The fair value of each option granted was estimated using the binomial tree pricing model with the following assumptions used during the applicable periods:
 
Risk-free
 interest
rate of return
   
Contractual term
   
Volatility
   
Dividend yield
   
Exercise price
(US$)
 
During the year ended December 31, 2018
   
3.39%~3.58
 %    
10 years
     
55.4%~55.6
 %    
—
      
0.0004
 
During the year ended December 31, 2019
 
 
2.45%~3.19
%
 
 
10 years
 
 
 
54.2%~55.5
%
 
 
—
 
 
 
0.0004