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Commitments and Contingencies - Arbitration Proceeding (Details) | 1 Months Ended
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Jun. 30, 2021 item
Commitments and Contingencies |
Number of arbitration proceedings initiated | 1

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

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- 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