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Royalty and Commercial Payment Purchase Agreements - Summary of Royalty Receivable Activities (Details) $ in Thousands | 6 Months Ended
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Jun. 30, 2022 USD ($)
Agreements |
Short-term royalty receivable, Balance at beginning of period | $ 0
Reclassification to short-term royalty and commercial payment receivable | 2,500
Short-term royalty receivable, Balance at end of period | 2,500
Long-term royalty receivable, Balance at beginning of period | 69,075
Reclassification to short-term royalty and commercial payment receivable | (2,500)
Long-term royalty receivable, Balance at end of period | $ 66,575

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- 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Long-term royalty and commercial rights receivables, non current. + References No definition available. + Details
Name: | xoma_LongTermRightsReceivableNonCurrent
Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Decrease in long term rights receivable due to reclassification to short-term rights receivable. + References No definition available. + Details
Name: | xoma_LongTermRightsReceivableReclassification
Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Royalty and commercial rights receivables, due 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

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- Definition Increase in short term rights receivable due to reclassification from long-term rights receivable. + References No definition available. + Details
Name: | xoma_ShortTermRightsReceivableReclassification
Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration