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Stock-Based Awards (Tables)
9 Months Ended
Sep. 30, 2021
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Unrecognized Stock-Based Compensation Expense and Average Remaining Vesting Period
A summary of unrecognized stock-based compensation expense and average remaining vesting period is as follows:
 
 
  
September 30, 2021
 
 
  
Unrecognized Stock-

Based

Compensation
 
  
Average

Remaining

Vesting Period
(Years)
 
 
  
 
 
  
 
 
Employees and directors
   $ 11,362        1.48  
 
Summary of Stock-Based Compensation Activity
A summary of stock-based compensation award activity during the three months ended September 30, 2021 is as follows:
 
 
  
Stock

Options
 
  
RSAs
 
  
RSUs
 
  
PRSUs
 
 
  
 
 
  
 
 
Balance at July 1, 2021
     47,500        3,043,948        53,209        550,686  
Granted
            47,393                
Exercised/vested
                           
Forfeitures
            (11,396              
    
 
 
    
 
 
    
 
 
    
 
 
 
Balance at September 30, 2021
     47,500        3,079,945        53,209        550,686