XML 79 R64.htm IDEA: XBRL DOCUMENT v2.4.0.6

Employee Benefit Plan (Details Textual) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
United States [Member]
Defined Contribution Plan Disclosure [Line Items]
Contribution pension plan	$ 111	$ 100	$ 72
Belgian [Member]
Defined Contribution Plan Disclosure [Line Items]
Contribution pension plan	$ 542	$ 515	$ 470

X

- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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