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v2.4.1.9

Goodwill - Schedule of Goodwill Activity (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Goodwill [Line Items] |  |
Beginning balance | $ 23,532 vdsi_GoodwillNet | $ 13,176 vdsi_GoodwillNet
Additions | 919 us-gaap_GoodwillAcquiredDuringPeriod |
Net foreign currency translation | (2,243)us-gaap_GoodwillTranslationAdjustments | 1,133 us-gaap_GoodwillTranslationAdjustments
Ending balance | 22,208 vdsi_GoodwillNet | 23,532 vdsi_GoodwillNet
December 31, 2014 balance at cost | 23,130 vdsi_GoodwillGross1 |
Accumulated amortization | (922)vdsi_AccumulatedAmortizationGoodwill |
Ending balance | 22,208 vdsi_GoodwillNet | 23,532 vdsi_GoodwillNet
Cronto [Member] |  |
Goodwill [Line Items] |  |
Additions |  | $ 9,223 us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_BusinessAcquisitionAxis = vdsi_CrontoMember

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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
Name: | us-gaap_GoodwillAcquiredDuringPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition Amount of increase (decrease) from foreign currency translation adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
Name: | us-gaap_GoodwillTranslationAdjustments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Accumulated amortization goodwill. + References No definition available. + Details
Name: | vdsi_AccumulatedAmortizationGoodwill
Namespace Prefix: | vdsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Gross amount of goodwill, as of balance sheet date, before amortization. + References No definition available. + Details
Name: | vdsi_GoodwillGross1
Namespace Prefix: | vdsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount after accumulated amortization of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References No definition available. + Details
Name: | vdsi_GoodwillNet
Namespace Prefix: | vdsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_BusinessAcquisitionAxis=vdsi_CrontoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |