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Acquisition of Cronto - Additional Information (Detail) (Cronto [Member]) In Thousands, unless otherwise specified | 0 Months Ended | 1 Months Ended | 12 Months Ended |  |  | 12 Months Ended
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May 20, 2013 USD ($) | May 20, 2013 EUR (€) | Jun. 30, 2013 USD ($) | Jun. 30, 2013 GBP (£) | Dec. 31, 2014 USD ($) | Dec. 31, 2014 EUR (€) | May 20, 2013 | Dec. 31, 2014 Minimum [Member] | Dec. 31, 2014 Maximum [Member]
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Percentage of stock acquired by the Company |  |  |  |  |  |  | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = vdsi_CrontoMember |  |
Initial consideration | $ 19,611 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = vdsi_CrontoMember | € 15,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = vdsi_CrontoMember |  |  |  |  |  |  |
Exchange rate |  |  | 1.55 us-gaap_ForeignCurrencyExchangeRateTranslation1 / us-gaap_BusinessAcquisitionAxis = vdsi_CrontoMember | 1.55 us-gaap_ForeignCurrencyExchangeRateTranslation1 / us-gaap_BusinessAcquisitionAxis = vdsi_CrontoMember |  |  | 1.31 us-gaap_ForeignCurrencyExchangeRateTranslation1 / us-gaap_BusinessAcquisitionAxis = vdsi_CrontoMember |  |
Additional consideration |  |  | 555 vdsi_BusinessCombinationContingentAdditionalConsiderationTransferred / us-gaap_BusinessAcquisitionAxis = vdsi_CrontoMember | 358 vdsi_BusinessCombinationContingentAdditionalConsiderationTransferred / us-gaap_BusinessAcquisitionAxis = vdsi_CrontoMember |  |  |  |  |
Contingent consideration |  |  |  |  | 2,620 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = vdsi_CrontoMember | 2,000 us-gaap_BusinessCombinationContingentConsiderationLiability / us-gaap_BusinessAcquisitionAxis = vdsi_CrontoMember |  |  |
Acquired identifiable intangible assets |  |  |  |  | $ 13,257 us-gaap_FinitelivedIntangibleAssetsAcquired1 / us-gaap_BusinessAcquisitionAxis = vdsi_CrontoMember |  |  |  |
Estimated useful lives of asset |  |  |  |  |  |  |  | 2 years | 5 years

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Details
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- Definition Percentage of voting equity interests acquired at the acquisition date in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 + Details
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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, resulting from a business combination. + References No definition available. + Details
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- Definition Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6897108&loc=SL6897125-166521 + Details
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- Definition Business combination contingent additional consideration transferred. + References No definition available. + Details
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