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Discontinued Operations - Schedule of Income Loss from Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (Loss) from discontinued operations	$ 941us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	$ (46)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	$ (7)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	$ (16)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	$ (105)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	$ (47)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	$ (41)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	$ 374us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	$ 873us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	$ 180us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	$ (630)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
DigiNotar B.V. [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (Loss) from operations									0us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax / us-gaap_BusinessAcquisitionAxis = vdsi_DigiNotarMember	0us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax / us-gaap_BusinessAcquisitionAxis = vdsi_DigiNotarMember	0us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax / us-gaap_BusinessAcquisitionAxis = vdsi_DigiNotarMember
Gain (Loss) on disposal									873us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalNetOfTax / us-gaap_BusinessAcquisitionAxis = vdsi_DigiNotarMember	180us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalNetOfTax / us-gaap_BusinessAcquisitionAxis = vdsi_DigiNotarMember	(630)us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalNetOfTax / us-gaap_BusinessAcquisitionAxis = vdsi_DigiNotarMember
Gain (Loss) from discontinued operations									$ 873us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity / us-gaap_BusinessAcquisitionAxis = vdsi_DigiNotarMember	$ 180us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity / us-gaap_BusinessAcquisitionAxis = vdsi_DigiNotarMember	$ (630)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity / us-gaap_BusinessAcquisitionAxis = vdsi_DigiNotarMember

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- Definition

Overall income (loss) from a disposal group that is classified as a component of the entity, before income tax, reported as a separate component of income before extraordinary items. Includes the following (before income tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 50

-Paragraph 1

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- Definition

Amount after tax of loss recognized for the write-down to fair value, less cost to sell, of a disposal group. Includes after tax gain for a subsequent increase in fair value (less cost to sell) up to the cumulative loss previously recognized through write-downs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Amount of income (loss) from a disposal group, net of income tax, reported as a separate component of income before extraordinary items after deduction or consideration of the amount allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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-Topic 810

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