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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, 2022
Mar. 31, 2021
Numerator:    
Net income (loss) attributable to Vicor Corporation $ 4,999 $ 15,092
Denominator:    
Denominator for basic net income per share-weighted average shares [1] 43,952 43,455
Effect of dilutive securities:    
Effect of dilutive securities: Employee stock options [2] 1,002 1,386
Denominator for diluted net income per share – adjusted weighted-average shares and assumed conversions 44,954 44,841
Basic net income (loss) per share $ 0.11 $ 0.35
Diluted net income (loss) per share $ 0.11 $ 0.34
[1] Denominator represents weighted average number of shares of Common Stock and Class B Common Stock outstanding.
[2] Options to purchase 291,880 and 40,339 shares of Common Stock for the three months ended March 31, 2022 and 2021, respectively, were not included in the calculations of net income per share as the effect would have been antidilutive.