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Stock-Based Compensation
 3 Months Ended
Mar. 31, 2023
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
March 31,		  
     2023      2022  
Cost of revenues
    $ 486      $ 251  
Selling, general and administrative
      1,520        1,207  
Research and development
      811        536  
    
 
 
     
 
 
  
Total stock-based compensation
    $ 2,817      $ 1,994  
    
 
 
     
 
 
  
Compensation expense by type of award was as follows (in thousands):
 
     Three Months Ended
March 31,		  
     2023      2022  
Stock options
    $ 2,496      $ 1,759  
ESPP
      321        235  
    
 
 
     
 
 
  
Total stock-based compensation
    $ 2,817      $ 1,994