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Component of Deferred Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Net operating loss carry forwards $ 178,008us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 147,655us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Research tax credit carry forwards 22,914us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 21,336us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Accruals and reserves 9,053us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves 9,501us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves
Capitalized research costs 8,601us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch 10,662us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
Deferred revenue 654us-gaap_DeferredTaxAssetsDeferredIncome 2,486us-gaap_DeferredTaxAssetsDeferredIncome
Other 1,531us-gaap_DeferredTaxAssetsOther 1,255us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 220,761us-gaap_DeferredTaxAssetsGross 192,895us-gaap_DeferredTaxAssetsGross
Less valuation allowance (220,544)us-gaap_DeferredTaxAssetsValuationAllowance (192,733)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets 217us-gaap_DeferredTaxAssetsNet 162us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities:    
Fixed Assets (217)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (162)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Total deferred tax liabilities $ (217)us-gaap_DeferredTaxLiabilities $ (162)us-gaap_DeferredTaxLiabilities