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Income Taxes - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Deferred Tax Assets Liabilities [Line Items]          
Tax benefit recognized   $ 0us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance      
Benefit for income taxes 552,000us-gaap_IncomeTaxExpenseBenefit (425,000)us-gaap_IncomeTaxExpenseBenefit 3,039,000us-gaap_IncomeTaxExpenseBenefit 1,207,000us-gaap_IncomeTaxExpenseBenefit  
Research tax credit carry forward extension period   2 years      
Federal research tax credit recorded   549,000us-gaap_TaxCreditCarryforwardDeferredTaxAsset      
Unremitted earnings of international subsidiaries   2,940,000us-gaap_UndistributedEarningsOfForeignSubsidiaries      
Unrecognized deferred tax liability   185,000us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfForeignSubsidiaries      
Valuation allowance, deferred tax assets   25,818,000us-gaap_DeferredTaxAssetsValuationAllowance 20,214,000us-gaap_DeferredTaxAssetsValuationAllowance    
Deferred tax assets valuation allowance increase     10,241,000vicr_DeferredTaxAssetsValuationAllowanceIncrease    
Amount generate in cash refund   1,600,000us-gaap_IncomeTaxReceivable      
Increases in equity of realization of deferred tax assets   3,024,000vicr_EquityImpactDueToRealizationOfDeferredTaxAssets      
Accrued interest   1,254,000us-gaap_UnrecognizedTaxBenefits 2,072,000us-gaap_UnrecognizedTaxBenefits 1,506,000us-gaap_UnrecognizedTaxBenefits 1,405,000us-gaap_UnrecognizedTaxBenefits
Net interest (benefit) expense   32,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense (28,000)us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense 32,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense  
Potential payment of interest   181,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued 149,000us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued    
Net tax benefit refunded from completion of examination $ 17,000us-gaap_IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthority        
Minimum [Member]          
Deferred Tax Assets Liabilities [Line Items]          
Income tax examination period   3 years      
Maximum [Member]          
Deferred Tax Assets Liabilities [Line Items]          
Income tax examination period   7 years      
Domestic Tax Authority [Member]          
Deferred Tax Assets Liabilities [Line Items]          
Federal net operating loss carryforwards expired   2033