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Net (Loss) Income per Share - Computation Of Basic And Diluted Net Income (Loss) Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Numerator:    
Net (loss) income attributable to Vicor Corporation $ (1,735) $ 4,286
Denominator:    
Denominator for basic net (loss) income per share-weighted average shares [1] 40,635 40,229
Effect of dilutive securities:    
Employee stock options [2]   800
Denominator for diluted net (loss) income per share – adjusted weighted-average shares and assumed conversions 40,635 41,029
Basic net (loss) income per share $ (0.04) $ 0.11
Diluted net (loss) income per share $ (0.04) $ 0.10
[1] Denominator represents weighted average number of shares of Common Stock and Class B Common Stock outstanding.
[2] Options to purchase 2,615,335 shares of Common Stock for the three months ended March 31, 2020, and 134,535 shares of Common Stock for the three months ended March 31, 2019, were not included in the calculations of net income per share as the effect would have been antidilutive.