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Royalty Purchase Agreements - Summary of Acquisition of Royalty Rights (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2021 USD ($)
Agreements |
Balance at beginning of period | $ 34,575
Balance at end of period | 55,075
Viracta |
Agreements |
Acquisition of royalty rights | 13,500
Kuros |
Agreements |
Acquisition of royalty rights | $ 7,000

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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 receivable non current. + References No definition available. + Details
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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
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Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |