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Deferred Warranty Revenue and Warranty Reserve - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2014
Minimum [Member]
Guarantor Obligations [Line Items]
Warranty for hardware purchase	1 year
Extended product warranty period	1 year
Maximum [Member]
Guarantor Obligations [Line Items]
Warranty for hardware purchase	2 years
Extended product warranty period	4 years

X

- Details

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

X

- Definition

Extended Warranty Period Related To Hardware Products

+ References

No definition available.

+ Details

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Namespace Prefix:	vdsi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Standard product warranty period.

+ References

No definition available.

+ Details

Name:	vdsi_StandardProductWarrantyPeriod
Namespace Prefix:	vdsi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: