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Warranties (Details Textual) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012
Warranties (Textual) [Abstract]
Deferred liability for extended warranty	$ 94

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- Definition

Deferred liability for extended warranty.

+ References

No definition available.

+ Details

Name:	vdsi_DeferredLiabilityForExtendedWarranty
Namespace Prefix:	vdsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Details

Name:	vdsi_WarrantiesTextualAbstract
Namespace Prefix:	vdsi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration