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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
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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 | $ 941 us-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 | $ 374 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | $ 873 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity | $ 180 us-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 |  |  |  |  |  |  |  |  | 0 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax / us-gaap_BusinessAcquisitionAxis = vdsi_DigiNotarMember | 0 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax / us-gaap_BusinessAcquisitionAxis = vdsi_DigiNotarMember | 0 us-gaap_DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax / us-gaap_BusinessAcquisitionAxis = vdsi_DigiNotarMember
Gain (Loss) on disposal |  |  |  |  |  |  |  |  | 873 us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalNetOfTax / us-gaap_BusinessAcquisitionAxis = vdsi_DigiNotarMember | 180 us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalNetOfTax / us-gaap_BusinessAcquisitionAxis = vdsi_DigiNotarMember | (630)us-gaap_DiscontinuedOperationProvisionForLossGainOnDisposalNetOfTax / us-gaap_BusinessAcquisitionAxis = vdsi_DigiNotarMember
Gain (Loss) from discontinued operations |  |  |  |  |  |  |  |  | $ 873 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity / us-gaap_BusinessAcquisitionAxis = vdsi_DigiNotarMember | $ 180 us-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 -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.12) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 05 -Paragraph 15 -Article 3 + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e957-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683 + Details
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