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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Assumptions in the Binomial Option-Pricing Model Used to Determine The Fair Value of Stock Options
The following table presents the weighted-average assumptions used to value options granted during the three months ended March 31, 2020:
 
2022: Expected term
     6.0 years  
Risk-free interest rate
    
0.9
Expected dividend yield
     0.0
Expected volatility
     60.7
Summary of Stock Option Activity
Activity with respect to stock options is summarized as follows:
 
    
Shares
    
Weighted-
Average
Exercise
Price
 
Options outstanding, January 1, 2022
  
 
34,709,027
 
   $ 0.64  
Granted
     —        $ —    
Exercised
     (3,336,683    $ 0.45  
Forfeited
     (459,787    $ 0.66  
Expired
     (2,595    $ 0.69  
    
 
 
          
Options outstanding, March 31, 2022
  
 
30,909,962
 
   $ 0.66  
    
 
 
          
Nonvested options, March 31, 2022
     22,213,714      $ 0.71  
    
 
 
          
Vested and exercisable, March 31, 2022
     9,140,656      $ 0.53  
    
 
 
          
Chief Executive Officer [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Summary of Assumptions in the Binomial Option-Pricing Model Used to Determine The Fair Value of Stock Options
The following table presents the key inputs and assumptions used to value the options granted to the Chief Executive Officer on the grant date:
 
Remaining term
     10.0 years  
Risk-free interest rate
     1.5
Expected dividend yield
     0.0
Expected volatility
     40.0