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Income Taxes Deferred Tax Reconciliation (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Deferred Tax Reconciliation [Abstract]    
Deferred Tax Assets, Tax Credit Carryforwards, Research $ 17,100,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch  
Deferred Tax Liabilities, Undistributed Foreign Earnings 200,000us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings  
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Warranty Reserves 937,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves 1,166,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves
Deferred Tax Assets, Inventory 1,731,000us-gaap_DeferredTaxAssetsInventory 2,952,000us-gaap_DeferredTaxAssetsInventory
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Restructuring Charges 58,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsRestructuringCharges 317,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsRestructuringCharges
Deferred Tax Assets, Operating Loss Carryforwards 61,521,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 52,248,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Deferred Tax Assets, Tax Credit Carryforwards 23,866,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 24,692,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost 2,042,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 2,490,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Deferred Tax Assets, in Process Research and Development 0us-gaap_DeferredTaxAssetsInProcessResearchAndDevelopment 144,000us-gaap_DeferredTaxAssetsInProcessResearchAndDevelopment
Deferred Tax Assets, Property, Plant and Equipment 950,000us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 2,437,000us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Deferred Tax Assets, Goodwill and Intangible Assets 2,516,000us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets 3,358,000us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets
Deferred Tax Assets, Other 4,056,000us-gaap_DeferredTaxAssetsOther 5,005,000us-gaap_DeferredTaxAssetsOther
Deferred Tax Assets, Gross 97,677,000us-gaap_DeferredTaxAssetsGross 94,809,000us-gaap_DeferredTaxAssetsGross
Deferred Tax Assets, Valuation Allowance (84,240,000)us-gaap_DeferredTaxAssetsValuationAllowance (76,873,000)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred Tax Assets, Net of Valuation Allowance 13,437,000us-gaap_DeferredTaxAssetsNet 17,936,000us-gaap_DeferredTaxAssetsNet
Deferred Tax Liabilities, Intangible Assets (11,955,000)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (13,636,000)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Deferred Tax Liabilities, Other (402,000)us-gaap_DeferredTaxLiabilitiesOther (493,000)us-gaap_DeferredTaxLiabilitiesOther
Deferred Tax Liabilities, Net (12,357,000)us-gaap_DeferredTaxLiabilities (14,129,000)us-gaap_DeferredTaxLiabilities
Deferred Tax Assets, Net 1,080,000us-gaap_DeferredTaxAssetsLiabilitiesNet 3,807,000us-gaap_DeferredTaxAssetsLiabilitiesNet
Undistributed Earnings of Foreign Subsidiaries $ 500,000us-gaap_UndistributedEarningsOfForeignSubsidiaries