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Royalty and Commercial Payment Purchase Agreements - Summary (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Royalty and Commercial Payment Purchase Agreements |  |
Short-term royalty and commercial payment receivables | $ 9,819 | $ 14,215
Long-term royalty and commercial payment receivables | $ 65,577 | $ 57,952

X
- Definition Royalty and commercial payment receivables probable and reasonably estimable to be received after one year or beyond the normal operating cycle, if longer. + References No definition available. + Details
Name: | xoma_LongTermRightsReceivableNonCurrent
Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Royalty and commercial payment receivables probable and reasonably estimable to be received within one year or the normal operating cycle, if longer. + References No definition available. + Details
Name: | xoma_RightsReceivableCurrent
Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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