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Income Taxes - Schedule of Company's Deferred Tax Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Net operating loss carryforwards $ 90,921us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 81,944us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Research and development tax credit carryforwards 8,646us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch 7,996us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
Stock-based compensation 8,171us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 7,927us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Deferred revenue 2,690us-gaap_DeferredTaxAssetsDeferredIncome 3,563us-gaap_DeferredTaxAssetsDeferredIncome
Other 2,471us-gaap_DeferredTaxAssetsOther 1,677us-gaap_DeferredTaxAssetsOther
Total deferred tax asset 112,899us-gaap_DeferredTaxAssetsGross 103,107us-gaap_DeferredTaxAssetsGross
Valuation allowance (112,899)us-gaap_DeferredTaxAssetsValuationAllowance (103,107)us-gaap_DeferredTaxAssetsValuationAllowance
Liabilities:    
Net deferred tax liability related to intangible assets (748)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets (748)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssets
Total deferred tax liability $ (748)us-gaap_DeferredTaxLiabilitiesNoncurrent $ (748)us-gaap_DeferredTaxLiabilitiesNoncurrent