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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 Country | Dec. 31, 2013 | Dec. 31, 2012
Schedule Of Accounting Policies [Line Items] |  |  |
Number of Countries in which Entity Operates | 14 us-gaap_NumberOfCountriesInWhichEntityOperates |  |
Gain or loss from foreign currency transactions | $ (1,382,000)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax | $ (624,000)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax | $ (410,000)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Percent of renewals within median VSOE range | 80.00%vdsi_PercentageOfRenewal |  |
Range within median renewal percentage rate | 15.00%vdsi_MedianRenewalPercentageRate |  |
Cash equivalents maturity, Term | Cash equivalents are high-quality short term money market instruments with maturities of three months or less. |  |
Software development costs were capitalized | 0 us-gaap_CapitalizedComputerSoftwareAdditions | 0 us-gaap_CapitalizedComputerSoftwareAdditions | 0 us-gaap_CapitalizedComputerSoftwareAdditions
Goodwill impairment | $ 0 us-gaap_GoodwillImpairmentLoss |  |
DigiNotar B.V. [Member] |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |
Percentage of stock acquired by the Company | 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired / us-gaap_BusinessAcquisitionAxis = vdsi_DigiNotarMember |  |
Patents [Member] |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |
Estimated useful lives of assets | 20 years |  |
Minimum [Member] |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |
Estimated useful lives of assets | 3 years |  |
Warranty for hardware purchase | 1 year |  |
Extended product warranty period | 1 year |  |
Minimum [Member] | Software Development Costs [Member] |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |
Estimated economic life of product | 2 years |  |
Minimum [Member] | Proprietary Technology [Member] |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |
Estimated useful lives of assets | 3 years |  |
Maximum [Member] |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |
Estimated useful lives of assets | 7 years |  |
Warranty for hardware purchase | 2 years |  |
Extended product warranty period | 4 years |  |
Maximum [Member] | Software Development Costs [Member] |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |
Estimated economic life of product | 5 years |  |
Maximum [Member] | Proprietary Technology [Member] |  |  |
Schedule Of Accounting Policies [Line Items] |  |  |
Estimated useful lives of assets | 7 years |  |

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