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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Current assets    
Cash and equivalents $ 74,207us-gaap_CashAndCashEquivalentsAtCarryingValue $ 72,441us-gaap_CashAndCashEquivalentsAtCarryingValue
Short term investments 74,879us-gaap_ShortTermInvestments 64,940us-gaap_ShortTermInvestments
Accounts receivable, net of allowance for doubtful accounts of $164 in 2015 and $223 in 2014 31,029us-gaap_AccountsReceivableNetCurrent 29,994us-gaap_AccountsReceivableNetCurrent
Inventories 32,697us-gaap_InventoryNet 33,875us-gaap_InventoryNet
Prepaid expenses 2,795us-gaap_PrepaidExpenseCurrent 2,312us-gaap_PrepaidExpenseCurrent
Foreign sales tax receivable 231us-gaap_ValueAddedTaxReceivableCurrent 598us-gaap_ValueAddedTaxReceivableCurrent
Deferred income taxes 143us-gaap_DeferredTaxAssetsNetCurrent 906us-gaap_DeferredTaxAssetsNetCurrent
Other current assets 1,384us-gaap_OtherAssetsCurrent 1,160us-gaap_OtherAssetsCurrent
Total current assets 217,365us-gaap_AssetsCurrent 206,226us-gaap_AssetsCurrent
Property and equipment:    
Furniture and fixtures 5,035us-gaap_FurnitureAndFixturesGross 5,231us-gaap_FurnitureAndFixturesGross
Office equipment 10,372vdsi_OfficeEquipmentGross 10,751vdsi_OfficeEquipmentGross
Property and equipment, gross 15,407us-gaap_PropertyPlantAndEquipmentGross 15,982us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation (12,721)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (13,157)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net 2,686us-gaap_PropertyPlantAndEquipmentNet 2,825us-gaap_PropertyPlantAndEquipmentNet
Goodwill, net of accumulated amortization 20,454vdsi_GoodwillNet 22,208vdsi_GoodwillNet
Intangible assets, net of accumulated amortization 11,692us-gaap_IntangibleAssetsNetExcludingGoodwill 12,819us-gaap_IntangibleAssetsNetExcludingGoodwill
Other assets, net of accumulated amortization 6,815us-gaap_OtherAssetsNoncurrent 7,260us-gaap_OtherAssetsNoncurrent
Total assets 259,012us-gaap_Assets 251,338us-gaap_Assets
Current liabilities    
Accounts payable 9,952us-gaap_AccountsPayableCurrent 10,680us-gaap_AccountsPayableCurrent
Deferred revenue 18,206us-gaap_DeferredRevenueCurrent 17,830us-gaap_DeferredRevenueCurrent
Accrued wages and payroll taxes 7,026us-gaap_EmployeeRelatedLiabilitiesCurrent 8,458us-gaap_EmployeeRelatedLiabilitiesCurrent
Income taxes payable 2,088us-gaap_AccruedIncomeTaxesCurrent 1,899us-gaap_AccruedIncomeTaxesCurrent
Other accrued expenses 5,013us-gaap_OtherAccruedLiabilitiesCurrent 5,413us-gaap_OtherAccruedLiabilitiesCurrent
Deferred compensation 86us-gaap_DeferredCompensationLiabilityCurrent 806us-gaap_DeferredCompensationLiabilityCurrent
Liabilities of discontinued operations 134us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent 111us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent
Total current liabilities 42,505us-gaap_LiabilitiesCurrent 45,197us-gaap_LiabilitiesCurrent
Other long-term liabilities 49us-gaap_OtherLiabilitiesNoncurrent 55us-gaap_OtherLiabilitiesNoncurrent
Deferred income taxes 126us-gaap_DeferredTaxLiabilitiesNoncurrent 213us-gaap_DeferredTaxLiabilitiesNoncurrent
Total liabilities 42,680us-gaap_Liabilities 45,465us-gaap_Liabilities
Stockholders' equity    
Common stock: $.001 par value per share, 75,000 shares authorized; 39,775 and 39,660 shares issued and outstanding at March 31, 2015 and December 31, 2014, respectively 40us-gaap_CommonStockValue 40us-gaap_CommonStockValue
Preferred stock: 500 shares authorized, none issued and outstanding at March 31, 2015 or December 31, 2014 0us-gaap_PreferredStockValue 0us-gaap_PreferredStockValue
Additional paid-in capital 82,819us-gaap_AdditionalPaidInCapital 82,450us-gaap_AdditionalPaidInCapital
Accumulated income 139,519us-gaap_RetainedEarningsAccumulatedDeficit 125,885us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive income (6,046)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (2,502)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total stockholders' equity 216,332us-gaap_StockholdersEquity 205,873us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 259,012us-gaap_LiabilitiesAndStockholdersEquity $ 251,338us-gaap_LiabilitiesAndStockholdersEquity