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Discontinued Operations - Summary of Assets and Liabilities of Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract] |  |
Contingent consideration due from escrow |  | $ 1,927 vdsi_DisposalGroupIncludingDiscontinuedOperationContingentConsiderationDueFromEscrow
Other |  | (17)vdsi_DisposalGroupIncludingDiscontinuedOperationIncomeTaxesRefundReceivablePayable
Assets of discontinued operations | 0 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent | 1,910 us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
Accrued professional fees | 25 us-gaap_AccruedProfessionalFeesCurrentAndNoncurrent | 30 us-gaap_AccruedProfessionalFeesCurrentAndNoncurrent
Income taxes payable | 86 vdsi_DisposalGroupIncludingDiscontinuedOperationIncomeTaxesRefundPayable |
Liabilities of discontinued operations | $ 111 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent | $ 30 us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent

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- Definition Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph a -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph 5 -Article 9 + Details
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- Definition Amount classified as assets attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759 + Details
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- Details
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- Definition Amount classified as liabilities attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6360339&loc=d3e1361-107760 + Details
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- Definition Disposal group including discontinued operation contingent consideration due from escrow. + References No definition available. + Details
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- Definition Disposal Group Including Discontinued Operation Income Taxes Refund Payable + References No definition available. + Details
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- Definition Disposal group including discontinued operation income taxes refund receivable payable. + References No definition available. + Details
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