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Statements of Mezzanine Equity and Stockholders’ Equity (Deficit) (USD $) In Thousands, except Share data, unless otherwise specified | Common Stock | Additional Paid-in Capital | Accumulated Deficit | Total
--- | --- | --- | --- | ---
Balance at Dec. 31, 2011 | $ 1 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 1,014 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (158,718)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (157,703)us-gaap_StockholdersEquity
Balance (in shares) at Dec. 31, 2011 | 72,302 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net loss |  |  | (8,594)xncr_NetProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (8,594)xncr_NetProfitLoss
Stock-based compensation expense |  | 29 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 29 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Balance at Dec. 31, 2012 | 1 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,043 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (167,312)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (166,268)us-gaap_StockholdersEquity
Balance (in shares) at Dec. 31, 2012 | 72,302 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Deemed contribution on exchange of Series A-E Preferred Stock for Series A-1 |  | 143,681 xncr_DeemedContributionOnExchangeOfPreferredStock1 / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 143,681 xncr_DeemedContributionOnExchangeOfPreferredStock1
Deemed contribution on exchange of Series A-1 preferred for Series A-2 preferred stock |  | 7,489 xncr_DeemedContributionOnExchangeOfPreferredStock2 / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 7,489 xncr_DeemedContributionOnExchangeOfPreferredStock2
Deemed dividend on sale of Series A-1 preferred |  | (3,429)xncr_ConvertiblePreferredStockDeemedDividend / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | (3,429)xncr_ConvertiblePreferredStockDeemedDividend
Exchange of Series A-1 and A-2 preferred for common stock | 166 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 79,435 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 79,601 us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
Exchange of Series A-1 and A-2 preferred for common stock (in shares) | 16,620,274 us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Sale of common stock, net of issuance cost | 146 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 72,361 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 72,507 us-gaap_StockIssuedDuringPeriodValueNewIssues
Sale of common stock, net of issuance cost (in shares) | 14,639,500 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Issuance of common stock upon exercise and vesting of stock awards | 1 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 12 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 13 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
Issuance of common stock upon exercise and vesting of stock awards (in shares) | 22,391 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Net loss |  |  | (60,259)xncr_NetProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (60,259)xncr_NetProfitLoss
Stock-based compensation expense |  | 198 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 198 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Balance at Dec. 31, 2013 | 314 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 300,790 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (227,571)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | 73,533 us-gaap_StockholdersEquity
Balance (in shares) at Dec. 31, 2013 | 31,354,467 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Issuance of common stock upon exercise and vesting of stock awards |  | 11 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 11 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
Issuance of common stock upon exercise and vesting of stock awards (in shares) | 15,941 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Issuance of common stock under the Employee Stock Purchase Plan |  | 307 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 307 us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan
Issuance of common stock under the Employee Stock Purchase Plan (in shares) | 63,864 us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |
Net loss |  |  | (16,422)xncr_NetProfitLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (16,422)xncr_NetProfitLoss
Stock-based compensation expense |  | 1,861 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  | 1,861 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue
Balance at Dec. 31, 2014 | $ 314 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 302,969 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (243,993)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ 59,290 us-gaap_StockholdersEquity
Balance (in shares) at Dec. 31, 2014 | 31,434,272 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |

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