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Stock-Based Compensation
 9 Months Ended
Sep. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-Based Compensation
8.
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
September 30,
   
Nine Months Ended
September 30,
 
  
2019
    
2018
    
2019
    
2018
  
Cost of revenues
  $
86
     $
58
     $
 
228
     $
173
  
Selling, general and administrative
   
482
      
474
      
1,507
      
1,973
  
Research and development
   
185
      
156
      
557
      
458
  
                                 
Total stock-based compensation
  $
753
     $
688
     $
2,292
     $
 
2,604
  
                                 
Compensation expense by type of award was as follows (in thousands):
 
Three Months Ended
September 30,
   
Nine Months Ended
September 30,
 
  
2019
    
2018
    
2019
    
2018
  
Stock options
  $
514
     $
503
     $
 
1,556
     $
2,101
  
ESPP
   
239
      
185
      
736
      
503
  
                                 
Total stock-based compensation
  $
753
     $
688
     $
2,292
     $
 
2,604