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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 |  | $ 0 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance |  |  |
Benefit for income taxes | 552,000 us-gaap_IncomeTaxExpenseBenefit | (425,000)us-gaap_IncomeTaxExpenseBenefit | 3,039,000 us-gaap_IncomeTaxExpenseBenefit | 1,207,000 us-gaap_IncomeTaxExpenseBenefit |
Research tax credit carry forward extension period |  | 2 years |  |  |
Federal research tax credit recorded |  | 549,000 us-gaap_TaxCreditCarryforwardDeferredTaxAsset |  |  |
Unremitted earnings of international subsidiaries |  | 2,940,000 us-gaap_UndistributedEarningsOfForeignSubsidiaries |  |  |
Unrecognized deferred tax liability |  | 185,000 us-gaap_DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiabilityUndistributedEarningsOfForeignSubsidiaries |  |  |
Valuation allowance, deferred tax assets |  | 25,818,000 us-gaap_DeferredTaxAssetsValuationAllowance | 20,214,000 us-gaap_DeferredTaxAssetsValuationAllowance |  |
Deferred tax assets valuation allowance increase |  |  | 10,241,000 vicr_DeferredTaxAssetsValuationAllowanceIncrease |  |
Amount generate in cash refund |  | 1,600,000 us-gaap_IncomeTaxReceivable |  |  |
Increases in equity of realization of deferred tax assets |  | 3,024,000 vicr_EquityImpactDueToRealizationOfDeferredTaxAssets |  |  |
Accrued interest |  | 1,254,000 us-gaap_UnrecognizedTaxBenefits | 2,072,000 us-gaap_UnrecognizedTaxBenefits | 1,506,000 us-gaap_UnrecognizedTaxBenefits | 1,405,000 us-gaap_UnrecognizedTaxBenefits
Net interest (benefit) expense |  | 32,000 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense | (28,000)us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense | 32,000 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense |
Potential payment of interest |  | 181,000 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued | 149,000 us-gaap_UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued |  |
Net tax benefit refunded from completion of examination | $ 17,000 us-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 |  |  |

X
- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition The amount of the additional liability or refund received or expected based on a final settlement with a taxing authority. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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