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Income Taxes - Deferred Income Tax Balances (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Income Tax Disclosure [Abstract] |  |
U.S. foreign tax credit | $ 5,516 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign | $ 5,058 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsForeign
Stock and long-term compensation plans | 1,693 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost | 1,318 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Foreign NOL & other carryforwards | 2,629 vdsi_ForeignNolAndOtherCarryForwards | 2,930 vdsi_ForeignNolAndOtherCarryForwards
US state income taxes | 263 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal | 574 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
US alternative minimum tax | 395 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax | 395 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
Deferred revenue | 752 vdsi_DeferredTaxAssetsDeferredRevenue | 965 vdsi_DeferredTaxAssetsDeferredRevenue
Reserve for uncertain tax issues | (560)us-gaap_LiabilityForUncertainTaxPositionsNoncurrent | (560)us-gaap_LiabilityForUncertainTaxPositionsNoncurrent
Amortization and depreciation | 434 vdsi_DeferredTaxAssetsDepreciationAndAmortization | 195 vdsi_DeferredTaxAssetsDepreciationAndAmortization
US tax on unremitted foreign earnings | (955)us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings | (380)us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings
Accrued expenses and other | 124 vdsi_DeferredTaxAssetsDeferredExpensesAndOther | (128)vdsi_DeferredTaxAssetsDeferredExpensesAndOther
Total gross deferred tax assets | 10,291 us-gaap_DeferredTaxAssetsGross | 10,367 us-gaap_DeferredTaxAssetsGross
Less: Valuation allowance | (2,500)us-gaap_DeferredTaxAssetsValuationAllowance | (2,399)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred income tax assets | 7,791 us-gaap_DeferredTaxAssetsNet | 7,968 us-gaap_DeferredTaxAssetsNet
Swiss tax allowances | 1,235 vdsi_DeferredTaxLiabilitiesTaxAllowances | 726 vdsi_DeferredTaxLiabilitiesTaxAllowances
Intangible assets | 213 us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets | 321 us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Deferred tax liabilities | $ 1,448 us-gaap_DeferredTaxLiabilities | $ 1,047 us-gaap_DeferredTaxLiabilities

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign tax credit carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=29652012&loc=d3e28680-109314 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition The noncurrent portion of the amount recognized for uncertain tax positions as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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