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Short-Term and Long-Term Investments - Amortized Cost and Estimated Fair Value of Available-for-Sale Securities by Contractual Maturities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Available-for-sale Securities, Debt Maturities [Abstract]    
Due in one year or less, Cost $ 270us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost  
Due in two to ten years, Cost 430vicr_AvailableForSaleSecuritiesDebtMaturitiesYearTwoThroughTenAmortizedCostBasis  
Due in ten to twenty years, Cost 0vicr_AvailableForSaleSecuritiesDebtMaturitiesYearTenThroughTwentyAmortizedCostBasis  
Due in twenty to forty years, Cost 3,000vicr_AvailableForSaleSecuritiesDebtMaturitiesYearTwentyThroughFortyAmortizedCostBasis  
Cost 3,700us-gaap_AvailableForSaleSecuritiesAmortizedCost 6,820us-gaap_AvailableForSaleSecuritiesAmortizedCost
Due in one year or less, Estimated Fair Value 270us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue  
Due in two to ten years, Estimated Fair Value 427vicr_AvailableForSaleSecuritiesDebtMaturitiesYearTwoThroughTenFairValue  
Due in ten to twenty years, Estimated Fair Value 0vicr_AvailableForSaleSecuritiesDebtMaturitiesYearTenThroughTwentyFairValue  
Due in twenty to forty years, Estimated Fair Value 2,575vicr_AvailableForSaleSecuritiesDebtMaturitiesYearTwentyThroughFortyFairValue  
Estimated Fair Value $ 3,272us-gaap_AvailableForSaleSecurities $ 5,651us-gaap_AvailableForSaleSecurities