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Statements of Mezzanine Equity and Stockholders’ Equity (USD $) In Thousands, except Share data, unless otherwise specified | Series A Convertible Preferred Stock | Series B Convertible Preferred Stock | Series C Convertible Preferred Stock | Series D Convertible Preferred Stock | Series E Convertible Preferred Stock | Series A-1 Convertible Preferred Stock | Series A-2 Convertible Preferred Stock | Total
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Balance at Dec. 31, 2012 | $ 3,550 us-gaap_TemporaryEquityCarryingAmountAttributableToParent / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | $ 12,375 us-gaap_TemporaryEquityCarryingAmountAttributableToParent / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | $ 50,000 us-gaap_TemporaryEquityCarryingAmountAttributableToParent / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember | $ 20,000 us-gaap_TemporaryEquityCarryingAmountAttributableToParent / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember | $ 60,841 us-gaap_TemporaryEquityCarryingAmountAttributableToParent / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember |  |  |
Balance (in shares) at Dec. 31, 2012 | 857,792 us-gaap_TemporaryEquitySharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | 1,328,941 us-gaap_TemporaryEquitySharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | 2,416,281 us-gaap_TemporaryEquitySharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember | 7,936,483 us-gaap_TemporaryEquitySharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember | 25,245,566 us-gaap_TemporaryEquitySharesOutstanding / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net loss |  |  |  |  |  |  |  | (60,259)xncr_NetProfitLoss
Stock-based compensation expense |  |  |  |  |  |  |  | 198 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Series A-1 shares issued in exchange of convertible notes |  |  |  |  |  | 70,689 us-gaap_DebtConversionConvertedInstrumentAmount1 / us-gaap_StatementClassOfStockAxis = xncr_SeriesA1ConvertiblePreferredStockMember |  |
Series A-1 shares issued in exchange of convertible notes (in shares) |  |  |  |  |  | 45,902,321 us-gaap_DebtConversionConvertedInstrumentSharesIssued1 / us-gaap_StatementClassOfStockAxis = xncr_SeriesA1ConvertiblePreferredStockMember |  |
Sale of Series A-1 preferred stock |  |  |  |  |  | 13,355 us-gaap_PreferredStockValue / us-gaap_StatementClassOfStockAxis = xncr_SeriesA1ConvertiblePreferredStockMember |  |
Sale of Series A-1 preferred stock (in shares) |  |  |  |  |  | 7,352,940 us-gaap_PreferredStockSharesIssued / us-gaap_StatementClassOfStockAxis = xncr_SeriesA1ConvertiblePreferredStockMember |  |
Exchange of Series A-1 and A-2 preferred for common stock |  |  |  |  |  | (78,526)us-gaap_ConversionOfStockAmountConverted1 / us-gaap_StatementClassOfStockAxis = xncr_SeriesA1ConvertiblePreferredStockMember | (1,075)us-gaap_ConversionOfStockAmountConverted1 / us-gaap_StatementClassOfStockAxis = xncr_SeriesA2ConvertiblePreferredStockMember |
Exchange of Series A-1 and A-2 preferred for common stock (in shares) |  |  |  |  |  | (49,671,392)us-gaap_ConversionOfStockSharesConverted1 / us-gaap_StatementClassOfStockAxis = xncr_SeriesA1ConvertiblePreferredStockMember | (1,851,814)us-gaap_ConversionOfStockSharesConverted1 / us-gaap_StatementClassOfStockAxis = xncr_SeriesA2ConvertiblePreferredStockMember |
Exchange of Series A-E Preferred for Series A-1 preferred stock | (3,550)xncr_ExchangeOfPreferredStockFromOneClassToAnother / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | (12,375)xncr_ExchangeOfPreferredStockFromOneClassToAnother / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | (50,000)xncr_ExchangeOfPreferredStockFromOneClassToAnother / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember | (20,000)xncr_ExchangeOfPreferredStockFromOneClassToAnother / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember | (60,841)xncr_ExchangeOfPreferredStockFromOneClassToAnother / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember | 3,045 xncr_ExchangeOfPreferredStockFromOneClassToAnother / us-gaap_StatementClassOfStockAxis = xncr_SeriesA1ConvertiblePreferredStockMember |  |
Exchange of Series A-E Preferred for Series A-1 preferred stock (in shares) | (857,792)xncr_ExchangeOfPreferredStockSharesFromOneClassToAnother / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesAPreferredStockMember | (1,328,941)xncr_ExchangeOfPreferredStockSharesFromOneClassToAnother / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesBPreferredStockMember | (2,416,281)xncr_ExchangeOfPreferredStockSharesFromOneClassToAnother / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesCPreferredStockMember | (7,936,483)xncr_ExchangeOfPreferredStockSharesFromOneClassToAnother / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesDPreferredStockMember | (25,245,566)xncr_ExchangeOfPreferredStockSharesFromOneClassToAnother / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember | 1,977,137 xncr_ExchangeOfPreferredStockSharesFromOneClassToAnother / us-gaap_StatementClassOfStockAxis = xncr_SeriesA1ConvertiblePreferredStockMember |  |
Exchange of Series A-1 preferred for Series A-2 preferred stock |  |  |  |  |  | $ (8,563)xncr_ExchangeOfPreferredStockFromOneClassToAnother1 / us-gaap_StatementClassOfStockAxis = xncr_SeriesA1ConvertiblePreferredStockMember | $ 1,075 xncr_ExchangeOfPreferredStockFromOneClassToAnother1 / us-gaap_StatementClassOfStockAxis = xncr_SeriesA2ConvertiblePreferredStockMember |
Exchange of Series A-1 preferred for Series A-2 preferred stock (in shares) |  |  |  |  |  | (5,561,006)xncr_ExchangeOfPreferredStockSharesFromOneClassToAnother1 / us-gaap_StatementClassOfStockAxis = xncr_SeriesA1ConvertiblePreferredStockMember | 1,851,814 xncr_ExchangeOfPreferredStockSharesFromOneClassToAnother1 / us-gaap_StatementClassOfStockAxis = xncr_SeriesA2ConvertiblePreferredStockMember |
Balance at Dec. 31, 2013 |  |  |  |  |  |  |  |

X
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- Definition Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29 -Article 5 + Details
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