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Significant Accounting Policies - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 Customer Distributor | Dec. 31, 2013 Customer | Dec. 31, 2012 Customer
Revenue, Major Customer [Line Items] |  |  |
Number of distributors | 2 vicr_NumberOfDistributors |  |
Gross deferred revenue | $ 1,769,000 us-gaap_DeferredRevenue | $ 1,269,000 us-gaap_DeferredRevenue |
Gross deferred cost of revenue | 808,000 vicr_GrossDeferredCostOfRevenue | 516,000 vicr_GrossDeferredCostOfRevenue |
Revenue recognized under multi-element | 3.00%vicr_RevenueRecognitionAsPercentageOfNetRevenue | 3.00%vicr_RevenueRecognitionAsPercentageOfNetRevenue | 3.00%vicr_RevenueRecognitionAsPercentageOfNetRevenue
Foreign currency losses, net | (196,000)us-gaap_ForeignCurrencyTransactionGainLossUnrealized | (94,000)us-gaap_ForeignCurrencyTransactionGainLossUnrealized | (46,000)us-gaap_ForeignCurrencyTransactionGainLossUnrealized
Maturity period of cash and cash equivalents | Less than three months |  |
Available-for-sale securities, failed auction, value | 3,000,000 us-gaap_AvailableforsaleSecuritiesFailedAuctionValue |  |
Number of customers accounted for trade account receivable | 2 vicr_NumberOfCustomersAccountedForTradeAccountReceivable | 2 vicr_NumberOfCustomersAccountedForTradeAccountReceivable |
Number of customers | 1 vicr_NumberOfCustomers | 2 vicr_NumberOfCustomers | 1 vicr_NumberOfCustomers
Cost of advertising | $ 1,832,000 us-gaap_AdvertisingExpense | $ 1,884,000 us-gaap_AdvertisingExpense | $ 1,910,000 us-gaap_AdvertisingExpense
Product warranty period | 2 years |  |
Percentage likelihood of tax benefit settlement | 50.00%vicr_LikelihoodPercentageOfTaxBenefitUponSettlement |  |
Recognition period of non performance based stock options | 5 years |  |
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of total net revenues | 14.70%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember |  | 10.10%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember
Sales Revenue, Net [Member] | Geographic Concentration Risk [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of total net revenues | 60.50%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_GeographicConcentrationRiskMember | 59.50%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_GeographicConcentrationRiskMember | 51.10%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_GeographicConcentrationRiskMember
Sales Revenue, Net [Member] | Hong Kong [Member] | Geographic Concentration Risk [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of total net revenues | 20.20%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_GeographicConcentrationRiskMember / us-gaap_StatementGeographicalAxis = country_HK | 16.20%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_GeographicConcentrationRiskMember / us-gaap_StatementGeographicalAxis = country_HK | 12.50%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_GeographicConcentrationRiskMember / us-gaap_StatementGeographicalAxis = country_HK
Sales Revenue, Net [Member] | CHINA | Geographic Concentration Risk [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of total net revenues | 12.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_GeographicConcentrationRiskMember / us-gaap_StatementGeographicalAxis = country_CN | 11.30%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_GeographicConcentrationRiskMember / us-gaap_StatementGeographicalAxis = country_CN |
Sales Revenue, Net [Member] | TAIWAN, PROVINCE OF CHINA | Geographic Concentration Risk [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of total net revenues |  |  | 9.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_GeographicConcentrationRiskMember / us-gaap_StatementGeographicalAxis = country_TW
Customer One [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of trade account receivable | 14.90%vicr_EntityWideAccountReceivableMajorCustomerPercentage / us-gaap_MajorCustomersAxis = vicr_CustomerOneMember | 12.90%vicr_EntityWideAccountReceivableMajorCustomerPercentage / us-gaap_MajorCustomersAxis = vicr_CustomerOneMember |
Customer One [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of total net revenues |  | 10.90%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = vicr_CustomerOneMember |
Customer Two [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of trade account receivable | 11.60%vicr_EntityWideAccountReceivableMajorCustomerPercentage / us-gaap_MajorCustomersAxis = vicr_CustomerTwoMember | 12.50%vicr_EntityWideAccountReceivableMajorCustomerPercentage / us-gaap_MajorCustomersAxis = vicr_CustomerTwoMember |
Customer Two [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of total net revenues |  | 10.10%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = vicr_CustomerTwoMember |
Maximum [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Recognition period | 12 months |  |
Estimated useful life of intangible assets | 20 years |  |
Minimum [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Recognition period | 6 months |  |
Estimated useful life of intangible assets | 3 years |  |

X
- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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Balance Type: | debit
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Balance Type: | na
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Balance Type: | na
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Balance Type: | na
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Balance Type: | na
Period Type: | duration

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