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v2.4.1.9

Income Taxes (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Reconciliation of federal statutory income tax rate to effective income tax rate |  |  |
Federal statutory income tax rate | $ (5,583,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ (20,488,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | $ (2,922,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Loss on settlement of notes |  | 18,884,000 xncr_IncomeTaxReconciliationLossOnSettlementOfNotes |
Non-deductible research and development credit | 435,000 us-gaap_IncomeTaxReconciliationNondeductibleExpenseResearchAndDevelopment |  | 336,000 us-gaap_IncomeTaxReconciliationNondeductibleExpenseResearchAndDevelopment
Stock based compensation | 478,000 us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost |  |
Other | 2,000 us-gaap_IncomeTaxReconciliationOtherAdjustments | 4,000 us-gaap_IncomeTaxReconciliationOtherAdjustments | 12,000 us-gaap_IncomeTaxReconciliationOtherAdjustments
Net change in valuation allowance | 4,668,000 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 1,600,000 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | 2,574,000 us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Net effective tax rate |  |  |
Deferred income tax assets |  |  |
Net operating loss carryforwards | 47,401,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards | 58,286,000 us-gaap_DeferredTaxAssetsOperatingLossCarryforwards |
Research credits | 12,789,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch | 24,276,000 us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch |
Depreciation | 790,000 us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment | 849,000 us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment |
Stock-based compensation |  | 52,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost |
Accrued compensation | 373,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation | 137,000 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation |
Deferred revenue | 1,836,000 us-gaap_DeferredTaxAssetsDeferredIncome | 3,899,000 us-gaap_DeferredTaxAssetsDeferredIncome |
Gross deferred income tax assets | 63,189,000 us-gaap_DeferredTaxAssetsGross | 87,499,000 us-gaap_DeferredTaxAssetsGross |
Valuation allowance | (59,602,000)us-gaap_DeferredTaxAssetsValuationAllowance | (84,045,000)us-gaap_DeferredTaxAssetsValuationAllowance |
Net deferred income tax assets | 3,587,000 us-gaap_DeferredTaxAssetsNet | 3,454,000 us-gaap_DeferredTaxAssetsNet |
Deferred income tax liabilities |  |  |
Patent costs | (3,199,000)us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedPatentCosts | (2,929,000)us-gaap_DeferredTaxLiabilitiesDeferredExpenseCapitalizedPatentCosts |
Licensing costs | (317,000)xncr_DeferredTaxLiabilitiesLicenseCosts | (406,000)xncr_DeferredTaxLiabilitiesLicenseCosts |
Capitalized legal costs | (71,000)xncr_DeferredTaxLiabilitiesCapitalizedLegalCosts | (119,000)xncr_DeferredTaxLiabilitiesCapitalizedLegalCosts |
Gross deferred income tax liabilities | (3,587,000)us-gaap_DeferredIncomeTaxLiabilities | (3,454,000)us-gaap_DeferredIncomeTaxLiabilities |
Net deferred income tax asset/(liability) |  |  |
Increase (decrease) in deferred tax asset valuation allowance |  | $ 3,000,000 us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount |

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