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Net Income (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		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Numerator:
Net income (loss) attributable to Vicor Corporation	$ (544)	$ 805	$ (5,895)	$ 4,176
Denominator:
Denominator for basic net income (loss) per share-weighted average shares	38,801	38,750	38,798	38,719
Effect of dilutive securities:
Employee stock options		543		502
Denominator for diluted net income (loss) per share - adjusted weighted-average shares and assumed conversions	38,801	39,293	38,798	39,221
Basic net income (loss) per share	$ (0.01)	$ 0.02	$ (0.15)	$ 0.11
Diluted net income (loss) per share	$ (0.01)	$ 0.02	$ (0.15)	$ 0.11

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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