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Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Net revenues	$ 225,731us-gaap_SalesRevenueNet	$ 199,160us-gaap_SalesRevenueNet	$ 218,507us-gaap_SalesRevenueNet
Cost of revenues	128,611us-gaap_CostOfGoodsAndServicesSold	117,681us-gaap_CostOfGoodsAndServicesSold	126,856us-gaap_CostOfGoodsAndServicesSold
Gross margin	97,120us-gaap_GrossProfit	81,479us-gaap_GrossProfit	91,651us-gaap_GrossProfit
Operating expenses:
Selling, general and administrative	68,197us-gaap_SellingGeneralAndAdministrativeExpense	60,737us-gaap_SellingGeneralAndAdministrativeExpense	55,655us-gaap_SellingGeneralAndAdministrativeExpense
Research and development	41,479us-gaap_ResearchAndDevelopmentExpense	39,848us-gaap_ResearchAndDevelopmentExpense	38,744us-gaap_ResearchAndDevelopmentExpense
Severance and other charges	2,207us-gaap_RestructuringCharges	1,361us-gaap_RestructuringCharges
Impairment of goodwill			2,012us-gaap_GoodwillImpairmentLoss
Gain from litigation-related settlement			(1,975)us-gaap_GainLossRelatedToLitigationSettlement
Total operating expenses	111,883us-gaap_OperatingExpenses	101,946us-gaap_OperatingExpenses	94,436us-gaap_OperatingExpenses
Loss from operations	(14,763)us-gaap_OperatingIncomeLoss	(20,467)us-gaap_OperatingIncomeLoss	(2,785)us-gaap_OperatingIncomeLoss
Other income (expense), net:
Total unrealized gains (losses) on available-for-sale securities, net	750us-gaap_MarketableSecuritiesUnrealizedGainLoss	(54)us-gaap_MarketableSecuritiesUnrealizedGainLoss	511us-gaap_MarketableSecuritiesUnrealizedGainLoss
Portion of gains recognized in other comprehensive income (loss)	(439)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	(24)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	(520)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax
Net credit gains (losses) recognized in earnings	311us-gaap_AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments	(78)us-gaap_AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments	(9)us-gaap_AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments
Other income (expense), net	(43)us-gaap_OtherNonoperatingIncomeExpense	80us-gaap_OtherNonoperatingIncomeExpense	203us-gaap_OtherNonoperatingIncomeExpense
Total other income (expense), net	268us-gaap_NonoperatingIncomeExpense	2us-gaap_NonoperatingIncomeExpense	194us-gaap_NonoperatingIncomeExpense
Loss before income taxes	(14,495)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	(20,465)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	(2,591)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
(Benefit) provision for income taxes	(425)us-gaap_IncomeTaxExpenseBenefit	3,039us-gaap_IncomeTaxExpenseBenefit	1,207us-gaap_IncomeTaxExpenseBenefit
Consolidated net loss	(14,070)us-gaap_ProfitLoss	(23,504)us-gaap_ProfitLoss	(3,798)us-gaap_ProfitLoss
Less: Net income (loss) attributable to noncontrolling interest	(183)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	136us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	279us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net loss attributable to Vicor Corporation	$ (13,887)us-gaap_NetIncomeLoss	$ (23,640)us-gaap_NetIncomeLoss	$ (4,077)us-gaap_NetIncomeLoss
Net loss per common share attributable to Vicor Corporation:
Basic	$ (0.36)us-gaap_EarningsPerShareBasic	$ (0.60)us-gaap_EarningsPerShareBasic	$ (0.10)us-gaap_EarningsPerShareBasic
Diluted	$ (0.36)us-gaap_EarningsPerShareDiluted	$ (0.60)us-gaap_EarningsPerShareDiluted	$ (0.10)us-gaap_EarningsPerShareDiluted
Shares used to compute net loss per common share attributable to Vicor Corporation:
Basic	38,569us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	39,195us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	41,811us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted	38,569us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	39,195us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	41,811us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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