XML 106 R61.htm IDEA: XBRL DOCUMENT
v3.20.1

Dispositions (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Nov. 04, 2015 | Dec. 31, 2018
Asset Purchase Agreement And Ology Bioservices License Agreement |  |
Dispositions |  |
Cash consideration |  | $ 4.6
Amount received from sale of discontinued operation |  | $ 2.5
Biodefense Business |  |
Dispositions |  |
Royalties receivable percentage on net sales | 15.00% |

X
- Definition Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation. + References No definition available. + Details
Name: | us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount received from sale of discontinued operation recognized as other income during the period. + References No definition available. + Details
Name: | xoma_AmountReceivedFromSaleOfDiscontinuedOperation
Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Royalty receivable entity is eligible to receive as a percentage on net sales. + References No definition available. + Details
Name: | xoma_RoyaltyReceivablePercentageOnNetSales
Namespace Prefix: | xoma_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=xoma_BiodefenseBusinessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |