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Stock-Based Compensation
 3 Months Ended
Mar. 31, 2021
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,		  
     2021      2020  
Cost of revenues
    $ 228      $ 119  
Selling, general and administrative
      853        437  
Research and development
      490        154  
    
 
 
     
 
 
  
Total stock-based compensation
    $ 1,571      $ 710  
    
 
 
     
 
 
  
Compensation expense by type of award was as follows (in thousands):
 
     Three Months Ended
March 31,		  
     2021      2020  
Stock options
    $ 1,331      $ 506  
ESPP
      240        204  
    
 
 
     
 
 
  
Total stock-based compensation
    $ 1,571      $ 710  
    
 
 
     
 
 
  
The increase in stock option compensation expense for the three months ended March 31, 2021 compared to the three months ended March 31, 2020, was primarily due to an increase in the number of stock options granted and higher stock-based compensation expense associated with June 2020 stock option awards.