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Geographic, Customer and Supplier Information - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2014 Customer Vendor Country | Dec. 31, 2013 | Dec. 31, 2012
Revenue, Major Customer [Line Items] |  |  |
Geographic regions | 4 vdsi_NumberOfGeographicalLocation |  |
Number of independent vendors | 4 vdsi_NumberOfVendors |  |
Top ten customers contribution of total worldwide revenue | 46.00%vdsi_EntityWidePercentageOfRevenueByMajorCustomerPercentage | 40.00%vdsi_EntityWidePercentageOfRevenueByMajorCustomerPercentage | 37.00%vdsi_EntityWidePercentageOfRevenueByMajorCustomerPercentage
Number of customers contributed | 10 vdsi_NumberOfRevenueContributors |  |
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customer One [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of revenue contributed by customer | 11.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = vdsi_CustomerOneMember | 18.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = vdsi_CustomerOneMember | 10.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = vdsi_CustomerOneMember
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Customer Two [Member] |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage of revenue contributed by customer | 12.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = vdsi_CustomerTwoMember |  |

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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- Definition Entity wide percentage of revenue by major customer percentage. + References No definition available. + Details
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- Definition Number of top revenue contributors. + References No definition available. + Details
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- Details
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