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Net Loss 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, 2017	Mar. 31, 2016
Numerator:
Net loss attributable to Vicor Corporation	$ (974)	$ (5,351)
Denominator:
Denominator for basic net loss per share-weighted average shares	39,070	38,794
Effect of dilutive securities:
Employee stock options	0	0
Denominator for diluted net loss per share - adjusted weighted-average shares and assumed conversions	39,070	38,794
Basic net loss per share	$ (0.02)	$ (0.14)
Diluted net loss per share	$ (0.02)	$ (0.14)

X

- Definition

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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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