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Stock Compensation Plans - Additional Information (Detail) (USD $) Share data in Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock Based Compensation [Line Items]
Stock Option	$ 0us-gaap_StockOptionPlanExpense	$ 0us-gaap_StockOptionPlanExpense	$ 0us-gaap_StockOptionPlanExpense
Options outstanding	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Exercise of stock options, Shares	20us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Issuance of stock	20vdsi_StockIssuedDuringPeriodSharesStockOptionsExercisedNet
Compensation expense	3,250,000us-gaap_AllocatedShareBasedCompensationExpense	2,587,000us-gaap_AllocatedShareBasedCompensationExpense	3,726,000us-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	62us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_VestingAxis = vdsi_EarnedRestrictedStockMember
Unearned Shares [Member]
Stock Based Compensation [Line Items]
Total unvested shares	254us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_VestingAxis = vdsi_UnearnedRestrictedStockMember
2009 Equity Incentive Plan [Member]
Stock Based Compensation [Line Items]
Number of shares allowed to be issued	6,597vdsi_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	0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember
Compensation expense	1,083,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember	600,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember	956,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember
Unamortized future compensation expense	1,454,000us-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	152vdsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsEarnedInPeriod / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember	0vdsi_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsEarnedInPeriod / us-gaap_AwardTypeAxis = us-gaap_PerformanceSharesMember	0vdsi_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	1,316,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	1,871,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	1,849,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Unamortized future compensation expense	718,000us-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		$ 16,000us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_StockCompensationPlanMember / us-gaap_PlanNameAxis = vdsi_TwoThousandAndTenIncentiveAwardPlanMember	$ 119,000us-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.

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Unrecognized cost of unvested share-based compensation awards.

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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).

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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.

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Number of options outstanding, including both vested and non-vested options.

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Description of pertinent provisions of equity-based compensation awards that have actual or potential impact upon the company's financial statements.

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Number of share options (or share units) exercised during the current period.

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Stock issued during period shares stock options exercised net.

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