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v3.20.2

Commitments and Contingencies - Collaborative Agreements, Royalties and Milestone Payments (Details) $ in Millions | Jun. 30, 2020 USD ($) product
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Commitments and Contingencies |
Estimate of milestone payments | $ | $ 7.6
Assumed number of products per contract | product | 1

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- 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 Potential estimated obligations that due and payable upon achievement of certain criteria categorized as developmental, regulatory, or commercial milestones. + References No definition available. + Details
Name: | xoma_ContractualObligationEstimatedMilestonePayments
Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Assumed number of products per contract meeting milestone events used to calculate potential milestone obligations. + References No definition available. + Details
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Namespace Prefix: | xoma_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant