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Income Taxes - Schedule of Significant Components of Deferred Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Research and development tax credit carryforwards $ 10,756us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch $ 8,754us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
Net operating loss carryforwards 3,560us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 2,497us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Stock-based compensation 3,465us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 3,048us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Inventory reserves 3,024us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves 2,687us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves
Vacation accrual 1,821vicr_DeferredTaxAssetsTaxVacationAccrual 1,645vicr_DeferredTaxAssetsTaxVacationAccrual
Investment tax credit carryforwards 1,446vicr_DeferredTaxAssetsTaxCreditCarryforwardsInvestments 1,367vicr_DeferredTaxAssetsTaxCreditCarryforwardsInvestments
Foreign tax credits 1,405us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign  
Accrued severance 525us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsSeverancePayments  
Alternative minimum tax credit carryforward 340us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 340us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
Deferred revenue 178us-gaap_DeferredTaxAssetsDeferredIncome 279us-gaap_DeferredTaxAssetsDeferredIncome
Unrealized loss on investments 131vicr_DeferredTaxAssetsUnrealizedLossOnInvestments 399vicr_DeferredTaxAssetsUnrealizedLossOnInvestments
Warranty reserves 65us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves 88us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves
Bad debt reserves 59us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 65us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Capital loss carryforward   680us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
Other 446us-gaap_DeferredTaxAssetsOther 428us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 27,221us-gaap_DeferredTaxAssetsGross 22,277us-gaap_DeferredTaxAssetsGross
Less: Valuation allowance for deferred tax assets (25,818)us-gaap_DeferredTaxAssetsValuationAllowance (20,214)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets 1,403us-gaap_DeferredTaxAssetsNet 2,063us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities:    
Depreciation (176)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (918)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Prepaid expenses (755)us-gaap_DeferredTaxLiabilitiesPrepaidExpenses (598)us-gaap_DeferredTaxLiabilitiesPrepaidExpenses
Patent amortization (365)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (416)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Unremitted Vicor Custom Power earnings (329)vicr_DeferredTaxLiabilitiesUnremittedCustomEarnings (335)vicr_DeferredTaxLiabilitiesUnremittedCustomEarnings
Total deferred tax liabilities (1,625)us-gaap_DeferredTaxLiabilities (2,267)us-gaap_DeferredTaxLiabilities
Net deferred tax liabilities $ (222)us-gaap_DeferredTaxAssetsLiabilitiesNet $ (204)us-gaap_DeferredTaxAssetsLiabilitiesNet