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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
Income Tax Disclosure [Abstract]    
Deferred revenue $ 1,005us-gaap_DeferredTaxAssetsDeferredIncome $ 6,073us-gaap_DeferredTaxAssetsDeferredIncome
Net operating loss carryforward 9,100us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 80,620us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Stock-based compensation 26,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 21,257us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Tax credits 12,098us-gaap_TaxCreditCarryforwardDeferredTaxAsset 22,616us-gaap_TaxCreditCarryforwardDeferredTaxAsset
Intangible assets 5,259us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets  
Accruals and reserves 15,247us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals 10,544us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Total deferred tax assets 68,709us-gaap_DeferredTaxAssetsGross 141,110us-gaap_DeferredTaxAssetsGross
Less: valuation allowance (16,023)us-gaap_DeferredTaxAssetsValuationAllowance (120,807)us-gaap_DeferredTaxAssetsValuationAllowance
Total net deferred tax assets 52,686us-gaap_DeferredTaxAssetsNet 20,303us-gaap_DeferredTaxAssetsNet
Depreciation (2,741)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (2,674)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Convertible Notes (12,792)us-gaap_DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts (17,629)us-gaap_DeferredTaxLiabilitiesDeferredExpenseDeferredFinancingCosts
Total deferred tax liabilities (15,533)us-gaap_DeferredIncomeTaxLiabilities (20,303)us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax assets 37,153us-gaap_DeferredTaxAssetsLiabilitiesNet  
Net current deferred tax assets 21,987us-gaap_DeferredTaxAssetsNetCurrent 5,541us-gaap_DeferredTaxAssetsNetCurrent
Net non-current deferred tax assets 15,176us-gaap_DeferredTaxAssetsNetNoncurrent  
Net non-current deferred tax liabilities (included in "Other non-current liabilities") (10)us-gaap_DeferredTaxLiabilitiesNoncurrent (5,541)us-gaap_DeferredTaxLiabilitiesNoncurrent
Net deferred tax assets $ 37,153us-gaap_DeferredTaxAssetsLiabilitiesNet