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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Numerator:        
Net income (loss) attributable to Vicor Corporation $ 1,792 $ 13,259 $ 17,384 $ 47,745
Denominator:        
Denominator for basic net income per share-weighted average shares [1] 44,031 43,710 43,986 43,573
Effect of dilutive securities:        
Employee stock options [2] 867 1,324 920 1,332
Denominator for diluted net income per share – adjusted weighted-average shares and assumed conversions 44,898 45,034 44,906 44,905
Basic net income (loss) per share $ 0.04 $ 0.3 $ 0.4 $ 1.1
Diluted net income (loss) per share $ 0.04 $ 0.29 $ 0.39 $ 1.06
[1] Denominator represents weighted average number of shares of Common Stock and Class B Common Stock outstanding.
[2] Options to purchase 1,037,640 and 772,240 shares of Common Stock for the three and nine months ended September 30, 2022, respectively, and options to purchase 76,114 and 134,822 shares of Common Stock for the three and nine months ended September 30, 2021, respectively, were not included in the calculations of net income per share as the effect would have been antidilutive.