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Income Taxes Components of Deferred Tax Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Components of Deferred Tax Assets and Liabilities [Abstract]    
Deferred revenue, current $ 1,120clro_DeferredTaxAssetsDeferredIncomeCurrent $ 971clro_DeferredTaxAssetsDeferredIncomeCurrent
Intangibles and related other, long-term 42clro_DeferredTaxLiabilitiesIntangibleAssetsLongTerm  
Deferred Tax Asset, Intangible Assets, Long Term   82clro_DeferredTaxAssetIntangibleAssetsLongTerm
Deferred Tax Asset, Inventory, Current 2,213clro_DeferredTaxAssetInventoryCurrent 1,955clro_DeferredTaxAssetInventoryCurrent
Net operationg loss carryforwards, long-term 957clro_DeferredTaxAssetsOperatingLossCarryforwardsLongTerm 682clro_DeferredTaxAssetsOperatingLossCarryforwardsLongTerm
Deferred Tax Assets, Tax Credit Carryforwards, Research 60us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch 31us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
Accrued expenses, current 117clro_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilitiesCurrent 159clro_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilitiesCurrent
Deferred Tax Asset, Expenses Long Term 175clro_DeferredTaxAssetExpensesLongTerm  
Stock-based compensation, long-term 577clro_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCostLongTerm 679clro_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCostLongTerm
Allowance for sales returns and doubtful accounts, current 22clro_DeferredTaxAssetTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccountsCurrent 47clro_DeferredTaxAssetTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccountsCurrent
Difference in property and equipment basis, long-term (318)clro_DeferredTaxAssetsPropertyPlantAndEquipmentDifferenceInBasisLongTerm (388)clro_DeferredTaxAssetsPropertyPlantAndEquipmentDifferenceInBasisLongTerm
Other, current 908clro_DeferredTaxAssetOtherCurrent 458clro_DeferredTaxAssetOtherCurrent
Other, long-term 2clro_DeferredTaxAssetsOtherLongTerm 51clro_DeferredTaxAssetsOtherLongTerm
Total net deferred income tax assets, current 4,380us-gaap_DeferredTaxAssetsGrossCurrent 3,590us-gaap_DeferredTaxAssetsGrossCurrent
Total net deferred income tax asset, long-term 1,495us-gaap_DeferredTaxAssetsGrossNoncurrent 1,137us-gaap_DeferredTaxAssetsGrossNoncurrent
Less: Valuation allowance, current (556)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent (265)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent
Less: valuation allowance, long-term (230)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent (113)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent
Net deferred income tax asset (liability), current 3,824us-gaap_DeferredTaxAssetsNetCurrent 3,325us-gaap_DeferredTaxAssetsNetCurrent
Net deferred income tax asset (liability), long-term $ 1,265us-gaap_DeferredTaxAssetsNetNoncurrent $ 1,024us-gaap_DeferredTaxAssetsNetNoncurrent