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Stock Compensation Plans - Time-Based Restricted Stock Activity (Detail) (Time Based Restricted Stock [Member], USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Time Based Restricted Stock [Member] |  |
Schedule Of Share Based Compensation Restricted Stock Units Award Activity [Line Items] |  |
Shares outstanding beginning balance | 424 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = vdsi_TimeBasedRestrictedStockMember |
Shares vested | (229)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = vdsi_TimeBasedRestrictedStockMember |
Shares awarded and issued | 45 vdsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAwardedInPeriod / us-gaap_AwardTypeAxis = vdsi_TimeBasedRestrictedStockMember |
Shares outstanding ending balance | 240 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = vdsi_TimeBasedRestrictedStockMember | 424 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = vdsi_TimeBasedRestrictedStockMember
Weighted average remaining term (Years) beginning balance | 1 year 6 months 11 days | 1 year 10 months 6 days
Aggregate intrinsic value, Beginning balance | $ 3,277 vdsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedAggregatedIntrinsicValue / us-gaap_AwardTypeAxis = vdsi_TimeBasedRestrictedStockMember |
Aggregate intrinsic value, Shares vested | 1,683 vdsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodAggregatedIntrinsicValuePeriodAggregatedIntrinsicValue / us-gaap_AwardTypeAxis = vdsi_TimeBasedRestrictedStockMember |
Aggregate intrinsic value, Shares awarded | 344 vdsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodAggregatedIntrinsicValue / us-gaap_AwardTypeAxis = vdsi_TimeBasedRestrictedStockMember |
Aggregate intrinsic value, Ending balance | $ 6,771 vdsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedAggregatedIntrinsicValue / us-gaap_AwardTypeAxis = vdsi_TimeBasedRestrictedStockMember | $ 3,277 vdsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedAggregatedIntrinsicValue / us-gaap_AwardTypeAxis = vdsi_TimeBasedRestrictedStockMember

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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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Period Type: | duration

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Details
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- Definition Share Based Compensation Arrangement By Share Based payment award equity instruments other than options awarded in period. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award equity instruments other than options grants in period aggregated intrinsic value. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award equity instruments other than options nonvested aggregated intrinsic value. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award equity instruments other than options vested in period aggregated intrinsic value period aggregated intrinsic value. + References No definition available. + Details
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