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Net Income (Loss) per Share - Computation of Basic and Diluted Net Income (Loss) per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Numerator:
Net income (loss) attributable to Vicor Corporation	$ 3,371us-gaap_NetIncomeLoss	$ (5,378)us-gaap_NetIncomeLoss
Denominator:
Denominator for basic net income (loss) per share-weighted average shares	38,689us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	38,541us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities:
Employee stock options	460us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Denominator for diluted net income (loss) per share - adjusted weighted-average shares and assumed conversions	39,149us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	38,541us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic net income (loss) per share	$ 0.09us-gaap_EarningsPerShareBasic	$ (0.14)us-gaap_EarningsPerShareBasic
Diluted net income (loss) per share	$ 0.09us-gaap_EarningsPerShareDiluted	$ (0.14)us-gaap_EarningsPerShareDiluted

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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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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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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