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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
Deferred tax assets:    
Net operating losses $ 70,666us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 67,507us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Credits 4,421us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 4,194us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Deferred revenues 2,697us-gaap_DeferredTaxAssetsDeferredIncome 1,198us-gaap_DeferredTaxAssetsDeferredIncome
Stock-based compensation 2,988us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 3,043us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Reserves and accruals 2,701us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation 3,626us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation
Depreciation 2,295us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 2,247us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Intangible assets 4,639us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets 4,208us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets
Capital losses 933us-gaap_DeferredTaxAssetsCapitalLossCarryforwards 0us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
Unrealized gain/loss 148us-gaap_DeferredTaxAssetsInvestments 112us-gaap_DeferredTaxAssetsInvestments
Other assets 101us-gaap_DeferredTaxAssetsOther 159us-gaap_DeferredTaxAssetsOther
Total deferred tax assets: 91,589us-gaap_DeferredTaxAssetsGross 86,294us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities:    
Other (186)us-gaap_DeferredTaxLiabilitiesOther 0us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities: (186)us-gaap_DeferredIncomeTaxLiabilities 0us-gaap_DeferredIncomeTaxLiabilities
Valuation allowance (91,513)us-gaap_DeferredTaxAssetsValuationAllowance (86,294)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax liabilities $ (110)us-gaap_DeferredTaxAssetsLiabilitiesNet $ 0us-gaap_DeferredTaxAssetsLiabilitiesNet