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v2.4.1.9

Deferred Warranty Revenue and Warranty Reserve - Deferred Warranty Revenue (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
Guarantees [Abstract] |
2015 | $ 38 vdsi_DeferredRevenueEstimatedRevenueExpectedRecognizedFiscalYear
2016 | 24 vdsi_DeferredRevenueEstimatedRevenueExpectedRecognizedYearTwo
2017 | 18 vdsi_DeferredRevenueEstimatedRevenueExpectedRecognizedYearThree
2018 | 9 vdsi_DeferredRevenueEstimatedRevenueExpectedRecognizedYearFour
2019 | 3 vdsi_DeferredRevenueEstimatedRevenueExpectedRecognizedYearFive
Total | $ 92 vdsi_DeferredRevenueEstimatedRevenueExpectedRecognized

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- Details
Name: | us-gaap_GuaranteesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The total amount of deferred revenue that will be recognized in future periods. + References No definition available. + Details
Name: | vdsi_DeferredRevenueEstimatedRevenueExpectedRecognized
Namespace Prefix: | vdsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Deferred revenue estimated revenue expected recognised fiscal year. + References No definition available. + Details
Name: | vdsi_DeferredRevenueEstimatedRevenueExpectedRecognizedFiscalYear
Namespace Prefix: | vdsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Deferred revenue estimated revenue expected recognized year five. + References No definition available. + Details
Name: | vdsi_DeferredRevenueEstimatedRevenueExpectedRecognizedYearFive
Namespace Prefix: | vdsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Deferred revenue estimated revenue expected recognized year four. + References No definition available. + Details
Name: | vdsi_DeferredRevenueEstimatedRevenueExpectedRecognizedYearFour
Namespace Prefix: | vdsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Deferred revenue estimated revenue expected recognized year three. + References No definition available. + Details
Name: | vdsi_DeferredRevenueEstimatedRevenueExpectedRecognizedYearThree
Namespace Prefix: | vdsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Deferred revenue estimated revenue expected recognised year two. + References No definition available. + Details
Name: | vdsi_DeferredRevenueEstimatedRevenueExpectedRecognizedYearTwo
Namespace Prefix: | vdsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration