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Stock-Based Compensation
3 Months Ended
Mar. 31, 2020
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-Based Compensation
6
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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,
 
 
2020
   
2019
 
Cost of revenues
  $
119
    $
69
 
Selling, general and administrative
   
437
     
519
 
Research and development
   
154
     
185
 
                 
Total stock-based compensation
  $
710
    $
773
 
                 
 
 
 
 
 
 
 
Compensation expense by type of award was as follows (in thousands):
                 
 
Three Months Ended
 
 
March 31,
 
 
2020
   
2019
 
Stock options
  $
  506
    $
  533
 
ESPP
   
204
     
240
 
                 
Total stock-based compensation
  $
  710
    $
  773