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Stock-Based Compensation
 6 Months Ended
Jun. 30, 2022
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-Based Compensation
6.
Stock-Based Compensation
The
Company uses the Black-Scholes option pricing model to calculate the fair value of stock option awards, whether they possess time-based vesting provisions or performance-based vesting provisions, and awards granted under the Vicor Corporation 2017 Employee Stock Purchase Plan (“ESPP”), as of their grant date. Stock-based compensation expense was as follows (in thousands):
 

 
  
Three Months Ended
June 30,
 
  
Six Months Ended
June 30,
 
 
  
2022
 
  
2021
 
  
2022
 
  
2021
 
Cost of revenues
   
$
431
     
$
252
     
$
682
     
$
480
  
Selling, general and administrative
   
 
1,440
     
 
779
     
 
2,647
     
 
1,632
  
Research and development
   
 
751
     
 
536
     
 
1,287
     
 
1,026
  
    
 
 
     
 
 
     
 
 
     
 
 
  
Total stock-based compensation
   
$
2,622
     
$
1,567
     
$
4,616
     
$
3,138
  
    
 
 
     
 
 
     
 
 
     
 
 
  
Compensation expense by type of award was as follows (in thousands):
 
 
  
Three Months Ended
June 30,
 
  
Six Months Ended
June 30,
 
 
  
2022
 
  
2021
 
  
2022
 
  
2021
 
Stock options
   
$
2,351
     
$
1,336
     
$
4,110
     
$
2,667
  
ESPP
   
 
271
     
 
231
     
 
506
     
 
471
  
    
 
 
     
 
 
     
 
 
     
 
 
  
Total stock-based compensation
   
$
2,622
     
$
1,567
     
$
4,616
     
$
3,138