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Net Income per Share
 9 Months Ended
Sep. 30, 2020
Earnings Per Share [Abstract]  
Net Income per Share
10.
Net Income per Share
The following table sets forth the computation of basic and diluted net income per share (in thousands, except per share amounts):
 
 
  
Three Months Ended
September 30,
 
  
Nine Months Ended
September 30,
 
 
  
2020
 
  
2019
 
  
2020
 
  
2019
 
Numerator:
  
      
  
      
  
      
  
      
Net income attributable to Vicor Corporation
  
$
5,785
  
  
$
5,937
  
  
$
6,717
  
  
$
12,786
  
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Denominator:
  
      
  
      
  
      
  
      
Denominator for basic net income per share-weighted average shares (1)
  
 
43,164
  
  
 
40,332
  
  
 
41,814
  
  
 
40,279
  
Effect of dilutive securities:
  
      
  
      
  
      
  
      
Employee stock options (2)
  
 
1,579
  
  
 
1,862
  
  
 
1,753
  
  
 
1,156
  
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Denominator for diluted net income per share – adjusted weighted-average shares and assumed conversions
  
 
44,743
  
  
 
42,194
  
  
 
43,567
  
  
 
41,435
  
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Basic net income per share
  
$
0.13
  
  
$
0.15
  
  
$
0.16
  
  
$
0.32
  
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Diluted net income per share
  
$
0.13
  
  
$
0.14
  
  
$
0.15
  
  
$
0.31
  
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
 
(1)
Denominator represents weighted average number of shares of Common Stock and Class B Common Stock outstanding.
(2)
Options to purchase 265,725 and 130,027 shares of Common Stock for the three and nine months ended September 30, 2020, respectively, and 171,499 and 138,251 shares of Common Stock for the three and nine months ended September 30, 2019, respectively, were not included in the calculations of net income per share as the effect would have been antidilutive.