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Significant Components of Deferred Tax Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets    
Losses & IRC Section 163(j) carryforwards $ 12,742us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 16,059us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Compensation related deductions 3,749us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits 2,649us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Tax credits 3,502us-gaap_TaxCreditCarryforwardDeferredTaxAsset 3,817us-gaap_TaxCreditCarryforwardDeferredTaxAsset
Restructuring related liabilities 64us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsRestructuringCharges 406us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsRestructuringCharges
Inventory 4,495us-gaap_DeferredTaxAssetsInventory 4,939us-gaap_DeferredTaxAssetsInventory
Depreciation 683us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 938us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Warranty 876us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves 888us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves
Other 2,206us-gaap_DeferredTaxAssetsOther 824us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 28,317us-gaap_DeferredTaxAssetsGross 30,520us-gaap_DeferredTaxAssetsGross
Valuation allowance for deferred tax assets (14,495)us-gaap_DeferredTaxAssetsValuationAllowance (11,534)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred income tax assets 13,822us-gaap_DeferredTaxAssetsNet 18,986us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities    
Equity investment (1,594)us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates (1,025)us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates
Depreciation (341)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (583)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Amortization (36)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (11,417)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Unrealized currency gain/loss (2,595)us-gaap_DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains (983)us-gaap_DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains
Other (525)us-gaap_DeferredTaxLiabilitiesOther (326)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities (5,091)us-gaap_DeferredTaxLiabilities (14,334)us-gaap_DeferredTaxLiabilities
Net deferred income tax assets (liabilities) $ 8,731us-gaap_DeferredTaxAssetsLiabilitiesNet $ 4,652us-gaap_DeferredTaxAssetsLiabilitiesNet