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v3.25.1

Commitments and Contingencies - Collaborative Agreements, Royalties and Milestone Payments (Details) $ in Millions | Mar. 31, 2025 USD ($) product
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Commitments And Contingencies |
Estimate of milestone payments | $ 5.3
Assumed number of products per contract | product | 1
Undisclosed licensor |
Commitments And Contingencies |
Accrued milestone payment | $ 1.0

X
- Definition Carrying value as of the balance sheet date of obligations incurred and payable related to milestone payments due. + References No definition available. + Details
Name: | xoma_AccruedMilestonePayment
Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Commitments and contingencies. + References No definition available. + Details
Name: | xoma_CommitmentsAndContingenciesLineItems
Namespace Prefix: | xoma_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Estimated potential obligations that come due and payable upon achievement of developmental, regulatory, or commercial milestones by company's licensees. Represent contingent payments not recorded on balance sheet. + References No definition available. + Details
Name: | xoma_ContractualObligationEstimatedMilestonePayments
Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Assumed number of products per contract meeting milestone events used to calculate potential milestone obligations. + References No definition available. + Details
Name: | xoma_ContractualObligationEstimatedMilestonePaymentsNumberOfProducts
Namespace Prefix: | xoma_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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