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v3.23.1

Royalty and Commercial Payment Purchase Agreements - Summary of Royalty Receivable Activities (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended
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Jul. 31, 2022 | Mar. 31, 2023
Agreements |  |
Short-term royalty receivable, Balance at beginning of period |  | $ 2,366
Short-term royalty receivable, Balance at end of period |  | 0
Long-term royalty receivable, Balance at beginning of period |  | 63,683
Long-term royalty receivable, Balance at end of period |  | 73,333
Aptevo |  |
Agreements |  |
Acquisition of royalty and commercial payment rights, Long-Term |  | 9,650
Affitech |  |
Agreements |  |
Receipt of royalty and commercial payments, Short-Term |  | $ (2,366)
Royalty Purchase Agreement | Kuros |  |
Agreements |  |
Receipt of royalty and commercial payments, Long-Term | $ (2,500) |

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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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- Definition Long-term royalty and commercial rights receivables, non current. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Decrease in short-term rights receivable due to receipt of current portion of royalty and commercial payments. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | duration

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- Definition Decrease in long-term rights receivable due to receipt of royalty and commercial payments. + References No definition available. + Details
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Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Royalty, interest and commercial payment rights receivable, due within one year or the normal operating cycle, if longer. + References No definition available. + Details
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Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
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- Definition Royalty, interest and commercial payment rights acquired, classified as noncurrent. + References No definition available. + Details
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Period Type: | duration

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

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

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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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