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Net Income (Loss) per Share
 3 Months Ended
Mar. 31, 2013
Net Income (Loss) per Share [Abstract]  
Net Income (Loss) per Share
5.   Net Income (Loss) per Share

The following table sets forth the computation of basic and diluted income (loss) per share for the three months ended March 31 (in thousands, except per share amounts):

 

                 
    Three Months Ended
March 31,		  
    2013     2012  
     

Numerator:

                

Net income (loss) attributable to Vicor Corporation

   $ (4,990 )    $ 326  
   

 

 

    

 

 

  

Denominator:

                

Denominator for basic income (loss) per share-weighted average shares (1)

     41,167       41,811  

Effect of dilutive securities:

                

Employee stock options (2)

     —         15  
   

 

 

    

 

 

  

Denominator for diluted income (loss) per share - adjusted weighted-average shares and assumed conversions

     41,167       41,826  
   

 

 

    

 

 

  
     

Basic income (loss) per share

   $ (0.12 )    $ 0.01  
   

 

 

    

 

 

  

Diluted income (loss) per share

   $ (0.12 )    $ 0.01  
   

 

 

    

 

 

  

 

(1) Denominator represents weighted average number of Common Shares and Class B Common Shares outstanding.
(2) Options to purchase 602,841 shares of Common Stock for the three months ended March 31, 2013 were not included in the calculation of net loss per share as the effect would have been antidilutive. Options to purchase 466,915 shares of Common Stock for the three months ended March 31, 2012 were not included in the computation of diluted income per share because the options’ exercise prices were greater than the average market price of the Common Stock and, therefore, the effect would be antidilutive.