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Condensed Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Revenue |  |  |
Collaborations, licenses and milestones, (including related party revenue of zero for 2014 and 2013 and $0.75 million for 2012, respectively) | $ 9,520 xncr_CollaborationsLicensesAndMilestonesRevenue | $ 10,172 xncr_CollaborationsLicensesAndMilestonesRevenue | $ 9,524 xncr_CollaborationsLicensesAndMilestonesRevenue
Operating expenses |  |  |
Research and development (including equity-based compensation of $1,013, $158 and $11 for 2014, 2013 and 2012, respectively) | 18,516 us-gaap_ResearchAndDevelopmentExpense | 17,000 us-gaap_ResearchAndDevelopmentExpense | 12,668 us-gaap_ResearchAndDevelopmentExpense
General and administrative (including equity-based compensation of $848, $40 and $18 for 2014, 2013 and 2012, respectively) | 7,461 us-gaap_GeneralAndAdministrativeExpense | 3,692 us-gaap_GeneralAndAdministrativeExpense | 3,086 us-gaap_GeneralAndAdministrativeExpense
Total operating expenses | 25,977 us-gaap_OperatingExpenses | 20,692 us-gaap_OperatingExpenses | 15,754 us-gaap_OperatingExpenses
Loss from operations | (16,457)us-gaap_OperatingIncomeLoss | (10,520)us-gaap_OperatingIncomeLoss | (6,230)us-gaap_OperatingIncomeLoss
Other income (expenses) |  |  |
Interest income | 33 us-gaap_InterestIncomeOther | 14 us-gaap_InterestIncomeOther | 11 us-gaap_InterestIncomeOther
Interest expense | (9)us-gaap_InterestExpense | (1,213)us-gaap_InterestExpense | (2,461)us-gaap_InterestExpense
Other (expense) income | 11 us-gaap_OtherNonoperatingIncomeExpense | 16 us-gaap_OtherNonoperatingIncomeExpense | 86 us-gaap_OtherNonoperatingIncomeExpense
Loss on settlement of notes |  | (48,556)us-gaap_ExtinguishmentOfDebtGainLossNetOfTax |
Total other income (expense), net | 35 us-gaap_NonoperatingIncomeExpense | (49,739)us-gaap_NonoperatingIncomeExpense | (2,364)us-gaap_NonoperatingIncomeExpense
Net loss | (16,422)xncr_NetProfitLoss | (60,259)xncr_NetProfitLoss | (8,594)xncr_NetProfitLoss
Deemed contribution (distribution) on exchange of preferred stock |  | 144,765 xncr_DeemedContributionOnExchangeOfPreferredStock |
Net income (loss) attributable to common stockholders | $ (16,422)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 84,506 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ (8,594)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Net income (loss) per share attributable to common shareholders: |  |  |
Basic (in dollars per share) | $ (0.52)us-gaap_EarningsPerShareBasic | $ 34.18 us-gaap_EarningsPerShareBasic | $ (118.86)us-gaap_EarningsPerShareBasic
Diluted (in dollars per share) | $ (0.52)us-gaap_EarningsPerShareDiluted | $ (3.85)us-gaap_EarningsPerShareDiluted | $ (118.86)us-gaap_EarningsPerShareDiluted
Weighted average shares used to compute net loss per share attributable to common stockholders: |  |  |
Basic (in shares) | 31,390,631 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 2,472,581 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 72,302 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares) | 31,390,631 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 15,645,789 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 72,302 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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