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v3.22.2.2

Subsequent Events (Details) - Subsequent Event | Nov. 01, 2022 period
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Current employees, excluding Chief Executive Officer |
Subsequent Event |
Number of periods in which employees will be eligible to receive cash retention bonus | 2
Initial period for which employees will be eligible for retention bonus | 3 months
Period following initial period for which employees will be eligible for retention bonus | 9 months
Senior Vice President, Finance and Chief Financial Officer |
Subsequent Event |
Period for which individual will be deemed retirement eligible for purposes of equity award | 12 months

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Period for which individual will be deemed retirement eligible for purposes of equity award if employed through the period under terms of amended employment agreement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | xoma_EmploymentPeriodRetirementEligible
Namespace Prefix: | xoma_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of periods in which individuals will be eligible to receive cash retention bonus under terms of amended retention plan. + References No definition available. + Details
Name: | xoma_NumberOfPeriodsCashRetentionBonus
Namespace Prefix: | xoma_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Initial period for which individuals will be eligible for retention bonus if employed through the period under terms of amended retention plan, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | xoma_PeriodOneRetentionBonusEligibility
Namespace Prefix: | xoma_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Period following initial period for which individuals will be eligible for retention bonus if employed through the period under terms of amended retention plan, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | xoma_PeriodTwoRetentionBonusEligibility
Namespace Prefix: | xoma_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_TitleOfIndividualAxis=xoma_CurrentEmployeesExcludingChiefExecutiveOfficerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_TitleOfIndividualAxis=xoma_SeniorVicePresidentFinanceAndChiefFinancialOfficerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |