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Sales of Future Royalties - Debt of Future Royalties (Details) $ in Thousands | 6 Months Ended
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Jun. 30, 2024 USD ($)
Sale of Future Royalty [Roll Forward] |
Beginning balance of debt related to sale of future royalties | $ 189,483
Royalties owed to OMERS | 834
Royalties paid to OMERS | (29,498)
Non-cash interest expense recognized | 18,937
Ending balance of debt related to sale of future royalties | 179,756
Debt - short-term | 38,930
Debt - long-term | 140,826
Total debt | $ 179,756

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- Definition Royalty Liabilities, Long-Term Debt + References No definition available. + Details
Name: | xncr_RoyaltyLiabilitiesLongTermDebt
Namespace Prefix: | xncr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Royalty Liabilities, Short-Term Debt + References No definition available. + Details
Name: | xncr_RoyaltyLiabilitiesShortTermDebt
Namespace Prefix: | xncr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Royalty Liability, Debt, Long-Term and Short-Term, Combined Amount + References No definition available. + Details
Name: | xncr_RoyaltyLiabilityDebtLongTermAndShortTermCombinedAmount
Namespace Prefix: | xncr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Royalty Liability, Interest Expense Including Amortization Of Closing Costs + References No definition available. + Details
Name: | xncr_RoyaltyLiabilityInterestExpenseIncludingAmortizationOfClosingCosts
Namespace Prefix: | xncr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Royalty Liability, Noncurrent + References No definition available. + Details
Name: | xncr_RoyaltyLiabilityNoncurrent
Namespace Prefix: | xncr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Royalty Liability, Owed + References No definition available. + Details
Name: | xncr_RoyaltyLiabilityOwed
Namespace Prefix: | xncr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Royalty Liability, Payments + References No definition available. + Details
Name: | xncr_RoyaltyLiabilityPayments
Namespace Prefix: | xncr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Sale of Future Royalty + References No definition available. + Details
Name: | xncr_SaleOfFutureRoyaltyRollForward
Namespace Prefix: | xncr_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration