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Net Income (Loss) per Share - Computation of Basic and Diluted Income (Loss) Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Numerator:
Net loss attributable to Vicor Corporation	$ (5,378)	$ (4,990)
Denominator:
Denominator for basic loss per share-weighted average shares	38,541	41,167
Effect of dilutive securities:
Employee stock options
Denominator for diluted loss per share - adjusted weighted-average shares and assumed conversions	38,541	41,167
Basic loss per share	$ (0.14)	$ (0.12)
Diluted loss per share	$ (0.14)	$ (0.12)

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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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