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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Numerator:        
Net income (loss) attributable to Vicor Corporation $ 13,259 $ 5,785 $ 47,745 $ 6,717
Denominator:        
Denominator for basic net income per share-weighted average shares [1] 43,710 43,164 43,573 41,814
Effect of dilutive securities:        
Employee stock options [2] 1,324 1,579 1,332 1,753
Denominator for diluted net income per share – adjusted weighted-average shares and assumed conversions 45,034 44,743 44,905 43,567
Basic net income (loss) per share $ 0.30 $ 0.13 $ 1.10 $ 0.16
Diluted net income (loss) per share $ 0.29 $ 0.13 $ 1.06 $ 0.15
[1] Denominator represents weighted average number of shares of Common Stock and Class B Common Stock outstanding.
[2] Options to purchase 76,114 and 134,822 shares of Common Stock for the three and nine months ended September 30, 2021, respectively, and options to purchase 265,725 and 130,027 shares of Common Stock for the three and nine months ended September 30, 2020, respectively, were not included in the calculations of net income per share as the effect would have been antidilutive.