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Stock Compensation Plans - Additional Information (Detail) (USD $) Share data in Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Stock Based Compensation [Line Items] |  |  |
Stock Option | $ 0 us-gaap_StockOptionPlanExpense | $ 0 us-gaap_StockOptionPlanExpense | $ 0 us-gaap_StockOptionPlanExpense
Options outstanding | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |  |
Exercise of stock options, Shares | 20 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |  |
Issuance of stock | 20 vdsi_StockIssuedDuringPeriodSharesStockOptionsExercisedNet |  |
Compensation expense | 3,250,000 us-gaap_AllocatedShareBasedCompensationExpense | 2,587,000 us-gaap_AllocatedShareBasedCompensationExpense | 3,726,000 us-gaap_AllocatedShareBasedCompensationExpense
Minimum [Member] | Employee Stock Option [Member] |  |  |
Stock Based Compensation [Line Items] |  |  |
Options granted terms | 6 years |  |
Vesting period | 1 year |  |
Maximum [Member] | Employee Stock Option [Member] |  |  |
Stock Based Compensation [Line Items] |  |  |
Options granted terms | 10 years |  |
Vesting period | 5 years |  |
One Year Performance Targets Based Shares [Member] |  |  |
Stock Based Compensation [Line Items] |  |  |
Performance stock vesting period | 4 years |  |
Three Year Performance Targets Based Shares [Member] |  |  |
Stock Based Compensation [Line Items] |  |  |
Performance stock vesting period | 3 years |  |
Earned Shares [Member] |  |  |
Stock Based Compensation [Line Items] |  |  |
Total unvested shares | 62 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_VestingAxis = vdsi_EarnedRestrictedStockMember |  |
Unearned Shares [Member] |  |  |
Stock Based Compensation [Line Items] |  |  |
Total unvested shares | 254 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_VestingAxis = vdsi_UnearnedRestrictedStockMember |  |
2009 Equity Incentive Plan [Member] |  |  |
Stock Based Compensation [Line Items] |  |  |
Number of shares allowed to be issued | 6,597 vdsi_ShareBasedCompensationAwardsNumberOfSharesAllowedToBeIssued / us-gaap_PlanNameAxis = vdsi_TwoThousandAndNineEquityIncentivePlanMember |  |
Percentage of Shares issued and outstanding | 16.60%vdsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfSharesOutstandingInPeriod / us-gaap_PlanNameAxis = vdsi_TwoThousandAndNineEquityIncentivePlanMember |  |
Performance Shares [Member] |  |  |
Stock Based Compensation [Line Items] |  |  |
Number of shares to be earned from awards granted | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |
Compensation expense | 1,083,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember | 600,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember | 956,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember
Unamortized future compensation expense | 1,454,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember |  |
Performance-based restricted stock awards, performance targets description | Performance-based restricted stock awards granted to executive officers in 2014 were subject to achievement of one-year and three year performance targets established by the Board of Directors. Earned shares related to one-year performance targets vest annually over four years. Earned shares related to three-year targets vest upon completion of the three-year period. |  |
Number of shares to be earned from awards granted | 152 vdsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsEarnedInPeriod / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember | 0 vdsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsEarnedInPeriod / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember | 0 vdsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsEarnedInPeriod / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember
Performance Shares [Member] | Minimum [Member] |  |  |
Stock Based Compensation [Line Items] |  |  |
Performance period | 1 year |  |
Performance Shares [Member] | Maximum [Member] |  |  |
Stock Based Compensation [Line Items] |  |  |
Performance period | 3 years |  |
Restricted Stock [Member] |  |  |
Stock Based Compensation [Line Items] |  |  |
Compensation expense | 1,316,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 1,871,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 1,849,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Unamortized future compensation expense | 718,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |
Stock Compensation Plan [Member] | Two Thousand Twelve Incentive Award Plan [Member] |  |  |
Stock Based Compensation [Line Items] |  |  |
Performance period |  |  | 1 year
Stock Compensation Plan [Member] | Two Thousand And Ten Incentive Award Plan [Member] |  |  |
Stock Based Compensation [Line Items] |  |  |
Vesting period |  |  | 3 years
Compensation expense |  | $ 16,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_StockCompensationPlanMember / us-gaap_PlanNameAxis = vdsi_TwoThousandAndTenIncentiveAwardPlanMember | $ 119,000 us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_StockCompensationPlanMember / us-gaap_PlanNameAxis = vdsi_TwoThousandAndTenIncentiveAwardPlanMember

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Description of pertinent provisions of equity-based compensation awards that have actual or potential impact upon the company's financial statements. + 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 (a) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of share options (or share units) exercised during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition Period For Achieving Performance Target + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award award options 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 earned in period. + References No definition available. + Details
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- Definition Share based compensation arrangement by Share based payment award percentage of shares issued and outstanding as of the balance sheet date. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award performance stock award vesting period. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment stock option vesting period which is contingent upon service. + References No definition available. + Details
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- Definition Share based compensation awards number of shares allowed to be issued. + References No definition available. + Details
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- Definition Stock issued during period shares stock options exercised net. + References No definition available. + Details
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