XML 77 R67.htm IDEA: XBRL DOCUMENT
v3.20.2

Commitments and Contingencies - Contingent Consideration (Details) - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2020 | Apr. 07, 2019 | Feb. 25, 2019
Commitments And Contingencies |  |  |
Change in fair value | $ 0.0 |  |
Aronora |  |  |
Commitments And Contingencies |  |  |
Contingent consideration liability | 0.0 |  |
Change in fair value | $ 0.0 |  |
Royalty Purchase Agreement | Bioasis Technologies Inc |  |  |
Commitments And Contingencies |  |  |
Contingent consideration liability |  |  | $ 0.1
Royalty Purchase Agreement | Aronora |  |  |
Commitments And Contingencies |  |  |
Contingent consideration liability |  | $ 3.0 |

X
- Definition Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Commitments and contingencies. + References No definition available. + Details
Name: | xoma_CommitmentsAndContingenciesLineItems
Namespace Prefix: | xoma_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Contingent consideration liability measured at fair value. + References No definition available. + Details
Name: | xoma_ContractualObligationContingentConsiderationLiability
Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | srt_CounterpartyNameAxis=xoma_AronoraIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=xoma_RoyaltyPurchaseAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CounterpartyNameAxis=xoma_BioasisTechnologiesIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |