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Discontinued Operations (Details Textual) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
Discontinued Operations (Textual) [Abstract]
Allowances for doubtful debts discontinued operations	$ 952

X

- Definition

Allowance for doubtful account of discontinued operations.

+ References

No definition available.

+ Details

Name:	vdsi_AllowanceForDoubtfulAccountOfDiscontinuedOperations
Namespace Prefix:	vdsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Details

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