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CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current assets:    
Cash and cash equivalents $ 2,656us-gaap_CashAndCashEquivalentsAtCarryingValue $ 3,564us-gaap_CashAndCashEquivalentsAtCarryingValue
Marketable securities    2,639us-gaap_MarketableSecurities
Accounts receivable, net of allowance for doubtful accounts of $516 and $1,173, respectively 4,219us-gaap_AccountsReceivableNetCurrent 5,252us-gaap_AccountsReceivableNetCurrent
Inventories 2,234us-gaap_InventoryNet 3,589us-gaap_InventoryNet
Prepaid expenses and other current assets 871us-gaap_PrepaidExpenseAndOtherAssetsCurrent 1,414us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 9,980us-gaap_AssetsCurrent 16,458us-gaap_AssetsCurrent
Property and equipment:    
Furniture and fixtures 620us-gaap_FurnitureAndFixturesGross 620us-gaap_FurnitureAndFixturesGross
Leasehold improvements 556us-gaap_LeaseholdImprovementsGross 511us-gaap_LeaseholdImprovementsGross
Equipment 3,964us-gaap_MachineryAndEquipmentGross 3,988us-gaap_MachineryAndEquipmentGross
Property and equipment, gross 5,140us-gaap_PropertyPlantAndEquipmentGross 5,119us-gaap_PropertyPlantAndEquipmentGross
Accumulated depreciation 4,279us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 4,094us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Property and equipment, net 861us-gaap_PropertyPlantAndEquipmentNet 1,025us-gaap_PropertyPlantAndEquipmentNet
Intangible assets, net 3,987us-gaap_IntangibleAssetsNetExcludingGoodwill 6,463us-gaap_IntangibleAssetsNetExcludingGoodwill
Deferred income taxes 62us-gaap_DeferredTaxAssetsNetNoncurrent 139us-gaap_DeferredTaxAssetsNetNoncurrent
Other assets    300us-gaap_OtherAssets
TOTAL ASSETS 14,890us-gaap_Assets 24,385us-gaap_Assets
LIABILITIES AND SHAREHOLDERS' EQUITY    
Accounts payable 3,315us-gaap_AccountsPayableCurrent 2,409us-gaap_AccountsPayableCurrent
Warranty and other current liabilities 2,096isns_WarrantyAndOtherCurrentLiabilities 1,959isns_WarrantyAndOtherCurrentLiabilities
Accrued compensation 687us-gaap_EmployeeRelatedLiabilitiesCurrent 1,202us-gaap_EmployeeRelatedLiabilitiesCurrent
Accrued restructuring 216us-gaap_RestructuringReserveCurrent   
Total current liabilities 6,314us-gaap_LiabilitiesCurrent 5,570us-gaap_LiabilitiesCurrent
Deferred income taxes 165us-gaap_DeferredIncomeTaxesAndOtherLiabilitiesNoncurrent 175us-gaap_DeferredIncomeTaxesAndOtherLiabilitiesNoncurrent
Other long-term liabilities 91us-gaap_OtherLiabilitiesNoncurrent 126us-gaap_OtherLiabilitiesNoncurrent
Shareholders' equity    
Preferred stock, $.01 par value; 5,000,000 shares authorized, none issued or outstanding      
Common stock, $.01 par value; 20,000,000 shares authorized, 4,995,963 and 4,974,847 issued and outstanding, respectively 49us-gaap_CommonStockValue 49us-gaap_CommonStockValue
Additional paid-in capital 23,547us-gaap_AdditionalPaidInCapital 23,276us-gaap_AdditionalPaidInCapital
Accumulated other comprehensive income (158)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax 604us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Accumulated deficit (15,118)us-gaap_RetainedEarningsAccumulatedDeficit (5,415)us-gaap_RetainedEarningsAccumulatedDeficit
Total shareholders' equity 8,320us-gaap_StockholdersEquity 18,514us-gaap_StockholdersEquity
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY $ 14,890us-gaap_LiabilitiesAndStockholdersEquity $ 24,385us-gaap_LiabilitiesAndStockholdersEquity