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Income Taxes (Details 1) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred Tax Assets and Liabilities    
Deferred Tax Assets, Operating Loss Carryforwards $ 255,518us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 238,608us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Deferred Tax Assets, Tax Credit Carryforwards, Research 40,173us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch 37,453us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch
Deferred Tax Assets, In Process Research and Development 95,946us-gaap_DeferredTaxAssetsInProcessResearchAndDevelopment 83,375us-gaap_DeferredTaxAssetsInProcessResearchAndDevelopment
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost 7,648us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 7,703us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Deferred Tax Assets, Deferred Income 4,457us-gaap_DeferredTaxAssetsDeferredIncome 4,760us-gaap_DeferredTaxAssetsDeferredIncome
Deferred Tax Assets, Other 8,681us-gaap_DeferredTaxAssetsOther 4,712us-gaap_DeferredTaxAssetsOther
Deferred Tax Assets, Gross 412,423us-gaap_DeferredTaxAssetsGross 376,611us-gaap_DeferredTaxAssetsGross
Deferred Tax Liability Related to Acquisition of Symphony Icon (18,675)lxrx_DeferredTaxLiabilityRelatedToAcquisitionOfSymphonyIcon (18,745)lxrx_DeferredTaxLiabilityRelatedToAcquisitionOfSymphonyIcon
Deferred Tax Liabilities, Gross (18,675)us-gaap_DeferredIncomeTaxLiabilities (18,745)us-gaap_DeferredIncomeTaxLiabilities
Deferred Tax Assets, Valuation Allowance (412,423)us-gaap_DeferredTaxAssetsValuationAllowance (376,611)us-gaap_DeferredTaxAssetsValuationAllowance
Deferred Tax Liabilities, Net $ (18,675)us-gaap_DeferredTaxLiabilities $ (18,745)us-gaap_DeferredTaxLiabilities