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Geographic, Customer and Supplier Information - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014 Customer Vendor Country	Dec. 31, 2013	Dec. 31, 2012
Revenue, Major Customer [Line Items]
Geographic regions	4vdsi_NumberOfGeographicalLocation
Number of independent vendors	4vdsi_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	10vdsi_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

X

- 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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- Details

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X

- Definition

Entity wide percentage of revenue by major customer percentage.

+ References

No definition available.

+ Details

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Balance Type:	na
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- Definition

Number of geographical location.

+ References

No definition available.

+ Details

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- Definition

Number of top revenue contributors.

+ References

No definition available.

+ Details

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Balance Type:	na
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- Definition

Number of vendors.

+ References

No definition available.

+ Details

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Namespace Prefix:	vdsi_
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- Details

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