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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 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Numerator:        
Net income attributable to Vicor Corporation $ 5,785 $ 5,937 $ 6,717 $ 12,786
Denominator:        
Denominator for basic net income per share-weighted average shares [1] 43,164 40,332 41,814 40,279
Effect of dilutive securities:        
Employee stock options [2] 1,579 1,862 1,753 1,156
Denominator for diluted net income per share – adjusted weighted-average shares and assumed conversions 44,743 42,194 43,567 41,435
Basic net income per share $ 0.13 $ 0.15 $ 0.16 $ 0.32
Diluted net income per share $ 0.13 $ 0.14 $ 0.15 $ 0.31
[1] Denominator represents weighted average number of shares of Common Stock and Class B Common Stock outstanding.
[2] Options to purchase 265,725 and 130,027 shares of Common Stock for the three and nine months ended September 30, 2020, respectively, and 171,499 and 138,251 shares of Common Stock for the three and nine months ended September 30, 2019, respectively, were not included in the calculations of net income per share as the effect would have been antidilutive.