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Summary of Significant Accounting Policies - Warranty (Details)	6 Months Ended
	Jun. 30, 2018
Minimum
Warranty
Standard product warranty period	1 year
Extended product warranty period	1 year
Maximum
Warranty
Standard product warranty period	2 years
Extended product warranty period	4 years

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_ProductWarrantyLiabilityLineItems
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

Name:	vdsi_ExtendedWarrantyPeriodRelatedToHardwareProducts
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

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: