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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, Gross [Abstract]    
Net operating loss carryforwards $ 166,150us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 168,431us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Tax credit carryforwards 25,052us-gaap_TaxCreditCarryforwardAmount 22,507us-gaap_TaxCreditCarryforwardAmount
Depreciation and Amortization 1,275us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 2,996us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Accruals and reserves 13,810us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 11,479us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Deferred revenue 9,930us-gaap_DeferredTaxAssetsDeferredIncome 12,037us-gaap_DeferredTaxAssetsDeferredIncome
Stock-based compensation 5,138us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 5,570us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Other 498us-gaap_DeferredTaxAssetsOther 450us-gaap_DeferredTaxAssetsOther
Gross deferred tax assets 221,853us-gaap_DeferredTaxAssetsGross 223,470us-gaap_DeferredTaxAssetsGross
Valuation allowance (212,703)us-gaap_DeferredTaxAssetsValuationAllowance (207,315)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets 9,150us-gaap_DeferredTaxAssetsNet 16,155us-gaap_DeferredTaxAssetsNet
Deferred Tax Liabilities, Gross [Abstract]    
Intangible assets (8,995)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets (15,988)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
Net deferred tax assets reflected in balance sheet 155us-gaap_DeferredTaxAssetsLiabilitiesNet 167us-gaap_DeferredTaxAssetsLiabilitiesNet
Deferred Tax Assets, Net [Abstract]    
Deferred tax assets, current 785us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 0us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Deferred tax assets, long-term 155us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent 167us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent
Deferred tax liabilities, long-term $ (785)us-gaap_DeferredTaxLiabilitiesNoncurrent $ 0us-gaap_DeferredTaxLiabilitiesNoncurrent