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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

Mar. 31, 2019

Mar. 31, 2018

Numerator:

Net income attributable to Vicor Corporation

$ 4,286

$ 3,943

Denominator:

Denominator for basic net income per share-weighted average shares

^[1]

40,229

39,479

Effect of dilutive securities:

Employee stock options

^[2]

800

688

Denominator for diluted net income per share - adjusted weighted-average shares and assumed conversions

41,029

40,167

Basic net income per share

$ 0.11

$ 0.10

Diluted net income per share

$ 0.10

$ 0.10

[1]	Denominator represents weighted average number of shares of Common Stock and Class B Common Stock outstanding.
[2]	Options to purchase 134,535 and 82,241 shares of Common Stock for the three months ended March 31, 2019 and 2018, respectively, were not included in the calculation of net income per share as the effect would have been antidilutive.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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