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Royalty and Commercial Payment Purchase Agreements - Under Cost Recovery Method (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
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Royalty and Commercial Payment Purchase Agreements |  |
Short-term royalty and commercial payment receivables under the cost recovery method | $ 413 | $ 413
Long-term royalty and commercial payment receivables under the cost recovery method | $ 59,916 | $ 55,936

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

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- Definition Royalty and commercial payment receivables under cost recovery method 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_RoyaltyAndCommercialPaymentReceivablesCostRecoveryMethodLongTerm
Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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