XML 61 R41.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Collaborative, Licensing and Other Arrangements - Rezolute - Additional Information (Details) - Rezolute [Member] - Collaborative Arrangement [Member] - USD ($) |  |  |  | 12 Months Ended | 18 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 06, 2017 | Dec. 31, 2017 | Jun. 01, 2019
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Future milestone payments, maximum |  |  | $ 232,000,000 |  |
Eligible to receive in cash |  |  | 6,000,000 |  |
Eligible to receive common stock, financing activities |  |  | $ 12,000,000 |  |
Number of shares of common stock held for future issuance |  |  | 5,000,000 |  |
Common stock purchase agreement description |  |  |  | Under the common stock purchase agreement, Rezolute granted the Company the right and option to sell the greater of (i) 5,000,000 shares of common stock or (ii) one third of the aggregate shares held by the Company upon failure by Rezolute to list its shares of its common stock on the Nasdaq Stock Market or a similar national exchange on or prior to December 31, 2018. |
Percentage of aggregate shares held for future issuance |  |  | 33.33% |  |
Agreement termination notice period |  |  | 90 days |  |
Milestone received under license agreement |  |  |  | $ 0 |
Forecast [Member] |  |  |  |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |
Future milestone payments, maximum |  |  |  |  | $ 237,000,000
Upfront option fee |  |  |  |  | $ 1,000,000
Gross proceeds from qualified financing |  | $ 20,000,000 |  |  |
Additional common stock receive for qualified financing |  | $ 7,000,000 |  |  |
Common stock, trading period |  | 10 days |  |  |
Eligible to receive, in order to maintain license agreement | $ 15,000,000 |  |  |  |

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_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Additional common stock receive for qualified financing. + References No definition available. + Details
Name: | xoma_AdditionalCommonStockReceiveForQualifiedFinancing
Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Agreement termination notice period. + References No definition available. + Details
Name: | xoma_AgreementTerminationNoticePeriod
Namespace Prefix: | xoma_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Refers to the maximum future development and sales milestone payments to be received by the Company. + References No definition available. + Details
Name: | xoma_CollaborativeArrangementContingentConsiderationPotentialCashPaymentMaximum
Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Common stock purchase agreement description. + References No definition available. + Details
Name: | xoma_CommonStockPurchaseAgreementDescription
Namespace Prefix: | xoma_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Common stock threshold trading days. + References No definition available. + Details
Name: | xoma_CommonStockThresholdTradingDays
Namespace Prefix: | xoma_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Eligible to receive common stock related to financing activities. + References No definition available. + Details
Name: | xoma_EligibleToReceiveCommonStockRelatedToFinancingActivities
Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Eligible to receive in cash. + References No definition available. + Details
Name: | xoma_EligibleToReceiveInCash
Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Eligible to receive in order to maintain license agreement. + References No definition available. + Details
Name: | xoma_EligibleToReceiveInOrderToMaintainLicenseAgreement
Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Gross proceeds from qualified financing. + References No definition available. + Details
Name: | xoma_GrossProceedsFromQualifiedFinancing
Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Milestone received under license agreement. + References No definition available. + Details
Name: | xoma_MilestoneReceivedUnderLicenseAgreement
Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percentage of aggregate shares held for future issuance. + References No definition available. + Details
Name: | xoma_PercentageOfAggregateSharesHeldForFutureIssuance
Namespace Prefix: | xoma_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Upfront option payment. + References No definition available. + Details
Name: | xoma_UpfrontOptionPayment
Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_CounterpartyNameAxis=xoma_RezoluteIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |