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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
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Deferred tax assets: |  |
Research and development tax credit carryforwards | $ 10,756 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch | $ 8,754 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
Net operating loss carryforwards | 3,560 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 2,497 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Stock-based compensation | 3,465 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost | 3,048 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Inventory reserves | 3,024 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves | 2,687 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsLossReserves
Vacation accrual | 1,821 vicr_DeferredTaxAssetsTaxVacationAccrual | 1,645 vicr_DeferredTaxAssetsTaxVacationAccrual
Investment tax credit carryforwards | 1,446 vicr_DeferredTaxAssetsTaxCreditCarryforwardsInvestments | 1,367 vicr_DeferredTaxAssetsTaxCreditCarryforwardsInvestments
Foreign tax credits | 1,405 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign |
Accrued severance | 525 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsSeverancePayments |
Alternative minimum tax credit carryforward | 340 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax | 340 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
Deferred revenue | 178 us-gaap_DeferredTaxAssetsDeferredIncome | 279 us-gaap_DeferredTaxAssetsDeferredIncome
Unrealized loss on investments | 131 vicr_DeferredTaxAssetsUnrealizedLossOnInvestments | 399 vicr_DeferredTaxAssetsUnrealizedLossOnInvestments
Warranty reserves | 65 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves | 88 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves
Bad debt reserves | 59 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts | 65 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Capital loss carryforward |  | 680 us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
Other | 446 us-gaap_DeferredTaxAssetsOther | 428 us-gaap_DeferredTaxAssetsOther
Total deferred tax assets | 27,221 us-gaap_DeferredTaxAssetsGross | 22,277 us-gaap_DeferredTaxAssetsGross
Less: Valuation allowance for deferred tax assets | (25,818)us-gaap_DeferredTaxAssetsValuationAllowance | (20,214)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets | 1,403 us-gaap_DeferredTaxAssetsNet | 2,063 us-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

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible research tax credit carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from severance costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from the allowance for doubtful accounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from warranty reserves. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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