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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		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Numerator:
Net income (loss) attributable to Vicor Corporation	$ (11)	$ 2,336	$ (1,444)	$ (3,559)
Denominator:
Denominator for basic net income (loss) per share-weighted average shares	39,288	38,837	39,177	38,811
Effect of dilutive securities:
Employee stock options		347
Denominator for diluted net income (loss) per share - adjusted weighted-average shares and assumed conversions	39,288	39,184	39,177	38,811
Basic net income (loss) per share	$ 0.00	$ 0.06	$ (0.04)	$ (0.09)
Diluted net income (loss) per share	$ 0.00	$ 0.06	$ (0.04)	$ (0.09)

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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