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Royalty Purchase Agreements - Summary of Acquisition of Royalty Rights (Details) $ in Thousands | 6 Months Ended
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Jun. 30, 2021 USD ($)
Agreements |
Balance at beginning of period | $ 34,575
Balance at end of period | 48,075
Viracta |
Agreements |
Acquisition of royalty rights | $ 13,500

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Long-term royalty receivable non current. + References No definition available. + Details
Name: | xoma_LongTermRoyaltyReceivableNonCurrent
Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Royalty rights acquired. + References No definition available. + Details
Name: | xoma_RoyaltyRightsAcquired
Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | srt_CounterpartyNameAxis=xoma_ViractaTherapeuticsInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |