XML 87 R69.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Income Taxes - Summary of Income Tax Examinations (Details) - Earliest period | 12 Months Ended
--- | ---
Dec. 31, 2017
Australia |
Earliest tax year subject to audit, by jurisdiction |
Earliest tax year subject to audit | 2009
Austria |
Earliest tax year subject to audit, by jurisdiction |
Earliest tax year subject to audit | 2011
Belgium |
Earliest tax year subject to audit, by jurisdiction |
Earliest tax year subject to audit | 2015
Canada |
Earliest tax year subject to audit, by jurisdiction |
Earliest tax year subject to audit | 2013
Netherlands |
Earliest tax year subject to audit, by jurisdiction |
Earliest tax year subject to audit | 2012
Singapore |
Earliest tax year subject to audit, by jurisdiction |
Earliest tax year subject to audit | 2012
Switzerland |
Earliest tax year subject to audit, by jurisdiction |
Earliest tax year subject to audit | 2016
United States |
Earliest tax year subject to audit, by jurisdiction |
Earliest tax year subject to audit | 2014

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

X
- Definition Tax year that remains open to examination under enacted tax laws, in CCYY format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
Name: | us-gaap_OpenTaxYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_TaxPeriodAxis=us-gaap_EarliestTaxYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_AustralianTaxationOfficeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityNameAxis=vdsi_AustriaFederalMinistryOfFinanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_AdministrationOfTheTreasuryBelgiumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_CanadaRevenueAgencyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_TaxAndCustomsAdministrationNetherlandsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_InlandRevenueSingaporeIRASMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_SwissFederalTaxAdministrationFTAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_InternalRevenueServiceIRSMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |