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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
Mar. 31, 2021
Mar. 31, 2020
Numerator:    
Net income (loss) attributable to Vicor Corporation $ 15,092 $ (1,735)
Denominator:    
Denominator for basic net income per share-weighted average shares [1] 43,455 40,635
Effect of dilutive securities:    
Employee stock options [2] 1,386  
Denominator for diluted net income per share – adjusted weighted-average shares and assumed conversions 44,841 40,635
Basic net income (loss) per share $ 0.35 $ (0.04)
Diluted net income (loss) per share $ 0.34 $ (0.04)
[1] Denominator represents weighted average number of shares of Common Stock and Class B Common Stock outstanding.
[2] Options to purchase 40,339 and 2,615,335 shares of Common Stock for the three months ended March 31, 2021 and 2020, respectively, were not included in the calculations of net income per share as the effect would have been antidilutive.