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Discontinued Operations - Summary of Assets and Liabilities of Discontinued Operations (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Disposal Group Including Discontinued Operation Balance Sheet Disclosures [Abstract]
Allowances for doubtful debts discontinued operations	$ 952

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- Details

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- Definition

Allowance for doubtful account of discontinued operations.

+ References

No definition available.

+ Details

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Namespace Prefix:	vdsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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