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Subsequent Events (Details) - Subsequent Event - Kuros Biosciences AG, Kuros US LLC and Kuros Royalty Fund (US) LLC - Royalty Purchase Agreement $ in Millions | Jul. 14, 2021 USD ($)
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Subsequent Event [Line Items] |
Royalties entity has right to receive (as a percent) | 100.00%
Pre-commercial milestone payments | $ 25.0
Upfront payment | $ 7.0

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Maximum eligible milestone payments receivable upon achievement of development, pre-commercial milestones. + References No definition available. + Details
Name: | xoma_EligibleMilestonePaymentsReceivableUponAchievementOfPreCommercialMilestones
Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Royalties entity has the right to receive as a percentage. + References No definition available. + Details
Name: | xoma_RoyaltyReceivablePercentageOnNetSales
Namespace Prefix: | xoma_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition The cash outflow for upfront payment. + References No definition available. + Details
Name: | xoma_UpfrontPayment
Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_CounterpartyNameAxis=xoma_KurosBiosciencesAgKurosUsLlcAndKurosRoyaltyFundUsLlcMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_TypeOfArrangementAxis=xoma_RoyaltyPurchaseAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |