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Condensed Consolidated Financial Statements Details - Arbitration Proceeding (Details) $ in Thousands | 1 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2021 item | Sep. 30, 2023 USD ($)
Commitments and Contingencies |  |
Number of arbitration proceedings initiated | item | 1 |
Arbitration settlement costs | $ |  | $ 4,132

X
- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of arbitration proceedings initiated by entity against one of its licensees. + References No definition available. + Details
Name: | xoma_NumberOfArbitrationProceedingsInitiated
Namespace Prefix: | xoma_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration