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Geographic, Customer and Supplier Information (Details Textual)	12 Months Ended
	Dec. 31, 2012 Customers Country	Dec. 31, 2011	Dec. 31, 2010
Geographic, Customer and Supplier Information (Textual) [Abstract]
Geographic regions	4
Top ten customers contribution of total worldwide revenue	37.00%	47.00%	37.00%
Approximate revenue contributed by one customer	10.00%	17.00%	11.00%
Number of customers contributed	10

X

- Definition

Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues.

+ References

No definition available.

+ Details

Name:	us-gaap_EntityWideRevenueMajorCustomerPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Entity wide percentage of revenue by major customer percentage.

+ References

No definition available.

+ Details

Name:	vdsi_EntityWidePercentageOfRevenueByMajorCustomerPercentage
Namespace Prefix:	vdsi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Definition

Number of geographical location.

+ References

No definition available.

+ Details

Name:	vdsi_NumberOfGeographicalLocation
Namespace Prefix:	vdsi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of major customers.

+ References

No definition available.

+ Details

Name:	vdsi_NumberOfMajorCustomers
Namespace Prefix:	vdsi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration