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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Numerator:        
Net income (loss) attributable to Vicor Corporation $ 19,394 $ 2,667 $ 34,486 $ 932
Denominator:        
Denominator for basic net income per share-weighted average shares [1] 43,553 41,643 43,504 41,140
Effect of dilutive securities:        
Employee stock options [2] 1,288 1,742 1,337 1,840
Denominator for diluted net income per share – adjusted weighted-average shares and assumed conversions 44,841 43,385 44,841 42,980
Basic net income (loss) per share $ 0.45 $ 0.06 $ 0.79 $ 0.02
Diluted net income (loss) per share $ 0.43 $ 0.06 $ 0.77 $ 0.02
[1] Denominator represents weighted average number of shares of Common Stock and Class B Common Stock outstanding.
[2] Options to purchase 138,125 and 90,339 shares of Common Stock for the three and six months ended June 30, 2021, respectively, and options to purchase 54,551 and 47,375 shares of Common Stock for the three and six months ended June 30, 2020, respectively, were not included in the calculations of net income per share as the effect would have been antidilutive.