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Net Income per Share - Computation Of Basic And Diluted Net Income Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Numerator:        
Net income attributable to Vicor Corporation $ 2,563 $ 7,860 $ 6,849 $ 11,803
Denominator:        
Denominator for basic net income per share-weighted average shares [1] 40,275 39,709 40,252 39,594
Effect of dilutive securities:        
Employee stock options [2] 806 937 803 812
Denominator for diluted net income per share - adjusted weighted-average shares and assumed conversions 41,081 40,646 41,055 40,406
Basic net income per share $ 0.06 $ 0.20 $ 0.17 $ 0.30
Diluted net income per share $ 0.06 $ 0.19 $ 0.17 $ 0.29
[1] Denominator represents weighted average number of shares of Common Stock and Class B Common Stock outstanding.
[2] Options to purchase 142,817 and 128,018 shares of Common Stock for the three and six months ended June 30, 2019, respectively, and 44,793 and 79,857 shares of Common Stock for the three and six months ended June 30, 2018, respectively, were not included in the calculation of net income per share as the effect would have been antidilutive.