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Stock-Based Compensation (Details) (USD $) | 12 Months Ended | 0 Months Ended | 13 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jan. 01, 2014 | Dec. 31, 2014 item | Dec. 02, 2013
Stock options |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |
Total number of shares of common stock available for issuance | 2,583,186 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_AwardTypeAxis = xncr_EmployeeAndNonEmployeeStockOptionMember | 2,403,368 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_AwardTypeAxis = xncr_EmployeeAndNonEmployeeStockOptionMember | 753,692 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_AwardTypeAxis = xncr_EmployeeAndNonEmployeeStockOptionMember |  | 2,583,186 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_AwardTypeAxis = xncr_EmployeeAndNonEmployeeStockOptionMember |
Information with respect to stock options outstanding |  |  |  |  |  |
Exercisable options (in shares) | 1,393,729 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_AwardTypeAxis = xncr_EmployeeAndNonEmployeeStockOptionMember | 1,203,885 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_AwardTypeAxis = xncr_EmployeeAndNonEmployeeStockOptionMember | 1,094,573 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_AwardTypeAxis = xncr_EmployeeAndNonEmployeeStockOptionMember |  | 1,393,729 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber / us-gaap_AwardTypeAxis = xncr_EmployeeAndNonEmployeeStockOptionMember |
Weighted-average exercise price per share of exercisable options (in dollars per share) | $ 1.01 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = xncr_EmployeeAndNonEmployeeStockOptionMember | $ 0.59 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = xncr_EmployeeAndNonEmployeeStockOptionMember | $ 0.59 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = xncr_EmployeeAndNonEmployeeStockOptionMember |  | 1.01 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_AwardTypeAxis = xncr_EmployeeAndNonEmployeeStockOptionMember |
Weighted average grant date fair value per share of options granted during the year (in dollars per share) | $ 7.39 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = xncr_EmployeeAndNonEmployeeStockOptionMember | $ 3.78 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = xncr_EmployeeAndNonEmployeeStockOptionMember | $ 0.34 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = xncr_EmployeeAndNonEmployeeStockOptionMember |  |  |
Weighted-average remaining contractual life | 6 years 5 months 5 days | 5 years 8 months 19 days | 7 years 9 months 15 days |  |  |
The 2010 Plan |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |
Total number of shares of common stock available for issuance | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = xncr_EquityIncentivePlan2010Member |  |  |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = xncr_EquityIncentivePlan2010Member |
The 2013 Plan |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |
Total number of shares of common stock available for issuance | 5,409,980 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = xncr_EquityIncentivePlan2013Member |  |  |  | 5,409,980 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = xncr_EquityIncentivePlan2013Member |
Annual percentage increase in shares of common stock available for issuance | 4.00%xncr_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualPercentageIncreaseInSharesAuthorized / us-gaap_PlanNameAxis = xncr_EquityIncentivePlan2013Member |  |  |  |  |
Increase in shares of common stock available for issuance (in shares) |  |  |  | 1,254,179 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_PlanNameAxis = xncr_EquityIncentivePlan2013Member |  |
Prior Plans |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |
Total number of shares of common stock available for issuance |  |  |  |  |  | 2 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = xncr_EquityIncentivePlan2000And2010Member
Employee Stock Purchase Plan |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |
Total number of shares of common stock available for issuance | 581,286 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember |  |  |  | 581,286 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember |
Initial term of plan | 2 years |  |  |  |  |
Number of six month purchase periods | 4 xncr_SharebasedCompensationArrangementBySharebasedPaymentAwardNumberOfPurchasePeriods / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember |  |  |  | 4 xncr_SharebasedCompensationArrangementBySharebasedPaymentAwardNumberOfPurchasePeriods / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember |
Purchase period | 6 months |  |  |  |  |
Increase in shares of common stock available for issuance (in shares) |  |  |  | 313,545 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAuthorized / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember |  |
Awards issued under the plan (in shares) |  |  |  |  | 63,864 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember |
Employee Stock Purchase Plan | Minimum |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |
Percentage of compensation that employees may withhold to purchase stock at a discount | 1.00%xncr_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfCompensationWithheldToPurchaseSharesAtDiscount / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  | 1.00%xncr_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfCompensationWithheldToPurchaseSharesAtDiscount / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember / us-gaap_RangeAxis = us-gaap_MinimumMember |
Employee Stock Purchase Plan | Maximum |  |  |  |  |  |
Stock-based compensation |  |  |  |  |  |
Percentage of compensation that employees may withhold to purchase stock at a discount | 15.00%xncr_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfCompensationWithheldToPurchaseSharesAtDiscount / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  | 15.00%xncr_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfCompensationWithheldToPurchaseSharesAtDiscount / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember / us-gaap_RangeAxis = us-gaap_MaximumMember |
Purchase price as percentage of stock price at the initial offering date | 85.00%xncr_ShareBasedCompensationArrangementByShareBasedPaymentAwardPurchasePriceOfCommonStockPercentageOnInitialOfferingDate / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |
Purchase price as percentage of stock price at the purchase date | 85.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |
Annual percentage increase in shares of common stock available for issuance | 1.00%xncr_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualPercentageIncreaseInSharesAuthorized / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |
Annual increase in shares of common stock available for issuance (in shares) | 621,814 xncr_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualIncreaseInSharesAuthorized / us-gaap_PlanNameAxis = us-gaap_EmployeeStockMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |

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- Definition Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Purchase price of common stock expressed as a percentage of its fair value. + References No definition available. + Details
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- Definition Number of share instruments newly issued under a share-based compensation plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Represents the annual increase in maximum number of shares (or other type of equity) approved (usually by shareholders and board of directors), for awards under the equity-based compensation plan. + References No definition available. + Details
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- Definition Represents the annual percentage increase in maximum number of shares (or other type of equity) approved (usually by shareholders and board of directors), for awards under the equity-based compensation plan. + References No definition available. + Details
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- Definition The initial period of time from the date the plan becomes effective until it expires. + References No definition available. + Details
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- Definition The percentage of annual compensation that employees may elect to have withheld to purchase stock at a discount. + References No definition available. + Details
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