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Deferred Warranty Revenue and Warranty Reserve - Deferred Warranty Revenue (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)
Guarantees [Abstract]
2016	$ 26
2017	20
2018	10
2019	4
Total	$ 60

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- References

No definition available.

+ Details

Name:	us-gaap_GuaranteesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

The total amount of deferred revenue that will be recognized in future periods.

+ References

No definition available.

+ Details

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Namespace Prefix:	vdsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Deferred revenue estimated revenue expected recognized fiscal year.

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No definition available.

+ Details

Name:	vdsi_DeferredRevenueEstimatedRevenueExpectedRecognizedFiscalYear
Namespace Prefix:	vdsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Deferred revenue estimated revenue expected recognized year four.

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No definition available.

+ Details

Name:	vdsi_DeferredRevenueEstimatedRevenueExpectedRecognizedYearFour
Namespace Prefix:	vdsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Deferred revenue estimated revenue expected recognized year three.

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No definition available.

+ Details

Name:	vdsi_DeferredRevenueEstimatedRevenueExpectedRecognizedYearThree
Namespace Prefix:	vdsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Deferred revenue estimated revenue expected recognized year two.

+ References

No definition available.

+ Details

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Namespace Prefix:	vdsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration