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Revenue - Capitalized Costs and Amortization (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Capitalized Contract Cost [Abstract]
Capitalized Contract Cost, Amortization Period	7 years
Capitalized costs to obtain contracts, current	$ 296
Capitalized costs to obtain contracts, non-current	1,540
Amortization of capitalized costs to obtain contracts	$ 65

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- References

No definition available.

+ Details

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

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- Definition

Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

+ Details

Name:	us-gaap_CapitalizedContractCostAmortization
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Definition

Amortization period of cost capitalized in obtaining or fulfilling contract with customer, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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

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- Definition

Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer; classified as current.

+ References

No definition available.

+ Details

Name:	vdsi_CapitalizedContractCostNetCurrent
Namespace Prefix:	vdsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Definition

Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer; classified as noncurrent.

+ References

No definition available.

+ Details

Name:	vdsi_CapitalizedContractCostNetNoncurrent
Namespace Prefix:	vdsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant