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Warranties - Additional Information (Detail) $ in Thousands	Sep. 30, 2015 USD ($)
Extended Warranty [Member]
Deferred revenue from extended warranties	$ 68

X

- Definition

Amount of deferred revenue as of balance sheet date. Deferred revenue represents collections of cash or other assets related to a revenue producing activity for which revenue has not yet been recognized. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 605



-SubTopic 10



-Section S99



-Paragraph 1



-Subparagraph (SAB TOPIC 13.A.4(a).Q1 Response)



-URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780



Reference 2: http://www.xbrl.org/2003/role/presentationRef



-Publisher SEC



-Name Staff Accounting Bulletin (SAB)



-Number Topic 13



-Section A

+ Details

Name:	us-gaap_DeferredRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_DeferredRevenueArrangementTypeAxis=vdsi_ExtendedProductWarrantyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: