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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2014
Country
Dec. 31, 2013
Dec. 31, 2012
Schedule Of Accounting Policies [Line Items]      
Number of Countries in which Entity Operates 14us-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 0us-gaap_CapitalizedComputerSoftwareAdditions 0us-gaap_CapitalizedComputerSoftwareAdditions 0us-gaap_CapitalizedComputerSoftwareAdditions
Goodwill impairment $ 0us-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