XML 56 R41.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Dispositions - Additional Information (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 04, 2015 | Feb. 28, 2017 | Jun. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Mar. 31, 2017
Asset Purchase Agreement and Ology Bioservices License Agreement [Member] |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Cash payments from Ology Bioservices |  | $ 4,500,000 |  |  |  |  |  |
Number of shares removed from obligation to issue of common stock |  | 23,008 |  |  |  |  |  |
Contingent upon achieving certain specified future operating objectives |  | $ 3,000,000 |  |  |  |  |  |
Amount entitled to receive |  |  |  |  |  |  |  | $ 1,600,000
Milestone payment earned |  |  |  | $ 3,000,000 |  |  |  |
Amount received from sale of discontinued operation |  |  | $ 1,000,000 |  | $ 300,000 | $ 2,000,000 | $ 400,000 |
Biodefense Business [Member] |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Sales of business, number of common stock shares eligible to receive | 23,008 |  |  |  |  |  |  |
Royalties receivable percentage on net sales | 15.00% |  |  |  |  |  |  |
Biodefense Business [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Cash payments from Ology Bioservices | $ 4,500,000 |  |  |  |  |  |  |

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. + References No definition available. + Details
Name: | xoma_AmountReceivedFromSaleOfDiscontinuedOperation
Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Cancellation of issuance of common stock under purchase agreement. + References No definition available. + Details
Name: | xoma_CancellationOfIssuanceOfCommonStockUnderPurchaseAgreement
Namespace Prefix: | xoma_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of contingent payments the company is entitled to receive related to sole performance of counterparty under the agreement. + References No definition available. + Details
Name: | xoma_ContingentPayment
Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Contingent payment upon achieving certain specified future operating objectives. + References No definition available. + Details
Name: | xoma_ContingentPaymentUponAchievingCertainSpecifiedFutureOperatingObjectives
Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Milestone payment earned. + References No definition available. + Details
Name: | xoma_MilestonePaymentEarned
Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Royalty receivable 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
- Definition Sales of business number of common stock shares eligible to receive. + References No definition available. + Details
Name: | xoma_SalesOfBusinessNumberOfCommonStockSharesEligibleToReceive
Namespace Prefix: | xoma_
Data Type: | xbrli:sharesItemType
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: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |