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Goodwill - Schedule of Goodwill Activity (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Beginning balance	$ 22,208vdsi_GoodwillNet
Additions	0us-gaap_GoodwillAcquiredDuringPeriod
Net foreign currency translation	(1,754)us-gaap_GoodwillTranslationAdjustments
Ending balance	20,454vdsi_GoodwillNet
March 31, 2015 balance at cost	21,277vdsi_GoodwillGross1
Accumulated amortization	(823)vdsi_AccumulatedAmortizationGoodwill
Ending balance	$ 20,454vdsi_GoodwillNet

X

- 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

X

- Details

Name:	us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- 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

X

- 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

X

- 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