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Collaborative, Licensing and Other Arrangements (Details) | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended | 1 Months Ended | 12 Months Ended |  | 3 Months Ended |  | 1 Months Ended | 12 Months Ended |  |  |  | 1 Months Ended | 12 Months Ended |  |  |
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Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2014 License Arrangement [Member] License | Dec. 31, 2014 National Institute of Allergy and Infectious Diseases "NIAID" [Member] Arrangement with Governmental Agency 1 [Member] USD ($) | Dec. 31, 2013 National Institute of Allergy and Infectious Diseases "NIAID" [Member] Arrangement with Governmental Agency 1 [Member] USD ($) | Dec. 31, 2012 National Institute of Allergy and Infectious Diseases "NIAID" [Member] Arrangement with Governmental Agency 1 [Member] USD ($) | Oct. 31, 2011 National Institute of Allergy and Infectious Diseases "NIAID" [Member] Arrangement with Governmental Agency 1 [Member] USD ($) | Dec. 31, 2014 National Institute of Allergy and Infectious Diseases "NIAID" [Member] Arrangement with Governmental Agency 2 [Member] USD ($) | Dec. 31, 2013 National Institute of Allergy and Infectious Diseases "NIAID" [Member] Arrangement with Governmental Agency 2 [Member] USD ($) | Dec. 31, 2012 National Institute of Allergy and Infectious Diseases "NIAID" [Member] Arrangement with Governmental Agency 2 [Member] USD ($) | Dec. 31, 2010 National Institute of Allergy and Infectious Diseases "NIAID" [Member] Arrangement with Governmental Agency 2 [Member] USD ($) | Dec. 31, 2009 National Institute of Allergy and Infectious Diseases "NIAID" [Member] Arrangement with Governmental Agency 2 [Member] USD ($) | Sep. 30, 2008 National Institute of Allergy and Infectious Diseases "NIAID" [Member] Arrangement with Governmental Agency 2 [Member] USD ($) | Dec. 31, 2014 National Institute of Allergy and Infectious Diseases "NIAID" [Member] Arrangement with Governmental Agency 3 [Member] USD ($) | Dec. 31, 2012 National Institute of Allergy and Infectious Diseases "NIAID" [Member] Arrangement with Governmental Agency 3 [Member] USD ($) | Jul. 31, 2006 National Institute of Allergy and Infectious Diseases "NIAID" [Member] Arrangement with Governmental Agency 3 [Member] USD ($) | Dec. 31, 2007 Pfizer Inc. [Member] License Arrangement [Member] USD ($) | Jan. 31, 2011 Collaborative Arrangement [Member] Servier [Member] USD ($) | Jan. 31, 2011 Collaborative Arrangement [Member] Servier [Member] EUR (€) | Dec. 31, 2014 Collaborative Arrangement [Member] Servier [Member] USD ($) | Dec. 31, 2013 Collaborative Arrangement [Member] Servier [Member] USD ($) | Dec. 31, 2012 Collaborative Arrangement [Member] Servier [Member] USD ($) | Dec. 31, 2014 Collaborative Arrangement [Member] Servier [Member] Sales And Development Milestones [Member] USD ($) | Sep. 30, 2010 Collaborative Arrangement [Member] Servier - U.S. Perindopril Franchise [Member] USD ($) | Dec. 31, 2014 Collaborative Arrangement [Member] Servier - U.S. Perindopril Franchise [Member] Product | Feb. 28, 2009 Collaborative Arrangement [Member] Takeda [Member] | Nov. 30, 2006 Collaborative Arrangement [Member] Takeda [Member] | Dec. 31, 2014 Collaborative Arrangement [Member] Takeda [Member] USD ($) | Dec. 31, 2013 Collaborative Arrangement [Member] Takeda [Member] USD ($) | Dec. 31, 2012 Collaborative Arrangement [Member] Takeda [Member] USD ($) | Dec. 31, 2014 Collaborative Arrangement [Member] Takeda [Member] Development Milestone [Member] USD ($) | Feb. 28, 2009 Collaborative Arrangement [Member] Takeda [Member] Sales Milestone [Member] USD ($) | Nov. 30, 2006 Collaborative Arrangement [Member] Takeda [Member] Sales Milestone [Member] USD ($) | Jan. 31, 2014 Collaborative Arrangement [Member] Novartis [Member] USD ($) | Nov. 30, 2008 Collaborative Arrangement [Member] Novartis [Member] USD ($) | Dec. 31, 2014 Collaborative Arrangement [Member] Novartis [Member] USD ($) | Dec. 31, 2013 Collaborative Arrangement [Member] Novartis [Member] USD ($) | Nov. 30, 2008 Collaborative Arrangement [Member] Novartis [Member] Development Milestone [Member] USD ($) Product | Dec. 31, 2014 Collaborative Arrangement [Member] Pfizer Inc. [Member] Sales Milestone [Member] USD ($) | Dec. 31, 2012 Non-arrangement Transactions [Member] Pfizer Inc. [Member] Development Milestone [Member] USD ($)
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-refundable upfront payment received |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,000,000 xoma_ProceedsFromUpfrontPaymentReceived / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty1Member / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period for recognizing deferred revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,500,000 us-gaap_ProceedsFromIssuanceOfDebt / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty1Member / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember | 15,000,000 us-gaap_ProceedsFromIssuanceOfDebt / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty1Member / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total contract amount awarded |  |  |  |  |  |  |  | 28,000,000 us-gaap_AccountsReceivableBilledForLongTermContractsOrPrograms / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty2Member / us-gaap_DeferredRevenueArrangementTypeAxis = xoma_NonsoftwareLicenseArrangementWithGovernmentalAgency1Member |  |  |  |  |  | 64,800,000 us-gaap_AccountsReceivableBilledForLongTermContractsOrPrograms / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty2Member / us-gaap_DeferredRevenueArrangementTypeAxis = xoma_NonsoftwareLicenseArrangementWithGovernmentalAgency2Member |  |  | 16,300,000 us-gaap_AccountsReceivableBilledForLongTermContractsOrPrograms / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty2Member / us-gaap_DeferredRevenueArrangementTypeAxis = xoma_NonsoftwareLicenseArrangementWithGovernmentalAgency3Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual term |  |  |  |  | 5 years |  |  |  | 3 years |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred revenue | 1,939,000 us-gaap_DeferredRevenueNoncurrent | 4,105,000 us-gaap_DeferredRevenueNoncurrent |  |  |  |  |  |  |  |  |  |  |  |  | 1,900,000 us-gaap_DeferredRevenueNoncurrent / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty2Member / us-gaap_DeferredRevenueArrangementTypeAxis = xoma_NonsoftwareLicenseArrangementWithGovernmentalAgency3Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (decrease) in deferred revenue |  |  |  |  |  |  |  |  |  |  |  | 900,000 us-gaap_DeferredRevenuePeriodIncreaseDecrease / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty2Member / us-gaap_DeferredRevenueArrangementTypeAxis = xoma_NonsoftwareLicenseArrangementWithGovernmentalAgency2Member | 1,100,000 us-gaap_DeferredRevenuePeriodIncreaseDecrease / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty2Member / us-gaap_DeferredRevenueArrangementTypeAxis = xoma_NonsoftwareLicenseArrangementWithGovernmentalAgency2Member |  | (1,800,000)us-gaap_DeferredRevenuePeriodIncreaseDecrease / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty2Member / us-gaap_DeferredRevenueArrangementTypeAxis = xoma_NonsoftwareLicenseArrangementWithGovernmentalAgency3Member | 2,000,000 us-gaap_DeferredRevenuePeriodIncreaseDecrease / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty2Member / us-gaap_DeferredRevenueArrangementTypeAxis = xoma_NonsoftwareLicenseArrangementWithGovernmentalAgency3Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Recognition of deferred revenue |  |  |  |  | 8,400,000 us-gaap_RecognitionOfDeferredRevenue / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty2Member / us-gaap_DeferredRevenueArrangementTypeAxis = xoma_NonsoftwareLicenseArrangementWithGovernmentalAgency1Member | 4,700,000 us-gaap_RecognitionOfDeferredRevenue / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty2Member / us-gaap_DeferredRevenueArrangementTypeAxis = xoma_NonsoftwareLicenseArrangementWithGovernmentalAgency1Member | 2,500,000 us-gaap_RecognitionOfDeferredRevenue / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty2Member / us-gaap_DeferredRevenueArrangementTypeAxis = xoma_NonsoftwareLicenseArrangementWithGovernmentalAgency1Member |  | 1,200,000 us-gaap_RecognitionOfDeferredRevenue / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty2Member / us-gaap_DeferredRevenueArrangementTypeAxis = xoma_NonsoftwareLicenseArrangementWithGovernmentalAgency2Member | 4,400,000 us-gaap_RecognitionOfDeferredRevenue / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty2Member / us-gaap_DeferredRevenueArrangementTypeAxis = xoma_NonsoftwareLicenseArrangementWithGovernmentalAgency2Member | 6,600,000 us-gaap_RecognitionOfDeferredRevenue / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty2Member / us-gaap_DeferredRevenueArrangementTypeAxis = xoma_NonsoftwareLicenseArrangementWithGovernmentalAgency2Member |  |  |  |  | 2,000,000 us-gaap_RecognitionOfDeferredRevenue / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty2Member / us-gaap_DeferredRevenueArrangementTypeAxis = xoma_NonsoftwareLicenseArrangementWithGovernmentalAgency3Member |  |  |  |  |  |  |  |  |  |  |  |  | 1,600,000 us-gaap_RecognitionOfDeferredRevenue / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty4Member / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember | 100,000 us-gaap_RecognitionOfDeferredRevenue / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty4Member / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember | 1,200,000 us-gaap_RecognitionOfDeferredRevenue / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty4Member / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember |  |  |  |  |  |  |  |  |  |
Remaining deferred revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000 xoma_RemainingDeferredRevenue / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty2Member / us-gaap_DeferredRevenueArrangementTypeAxis = xoma_NonsoftwareLicenseArrangementWithGovernmentalAgency3Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Future initial research and development expenses to be funded by counterparty |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 xoma_FutureInitialResearchAndDevelopmentExpensesToBeFundedByCounterpartyUnderCollaborativeArrangement / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty1Member / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Future other expenses to be funded by counterparty (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00%xoma_OtherExpenseFundedThroughCollaborativeArrangementPercentage / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty1Member / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Licensing and collaboration agreement revenue | 5,683,000 us-gaap_LicenseAndServicesRevenue | 11,028,000 us-gaap_LicenseAndServicesRevenue | 5,727,000 us-gaap_LicenseAndServicesRevenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,500,000 us-gaap_LicenseAndServicesRevenue / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty1Member / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember | 13,600,000 us-gaap_LicenseAndServicesRevenue / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty1Member / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember | 14,500,000 us-gaap_LicenseAndServicesRevenue / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty1Member / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Future milestone payments, maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 433,000,000 xoma_CollaborativeArrangementContingentConsiderationPotentialCashPaymentMaximum / us-gaap_ContingentConsiderationByTypeAxis = xoma_SalesAndDevelopmentMilestoneMember / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty1Member / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember |  |  |  |  |  |  |  |  | 3,250,000 xoma_CollaborativeArrangementContingentConsiderationPotentialCashPaymentMaximum / us-gaap_ContingentConsiderationByTypeAxis = xoma_SalesMilestoneMember / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty4Member / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember | 19,000,000 xoma_CollaborativeArrangementContingentConsiderationPotentialCashPaymentMaximum / us-gaap_ContingentConsiderationByTypeAxis = xoma_SalesMilestoneMember / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty4Member / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember |  |  |  |  | 14,000,000 xoma_CollaborativeArrangementContingentConsiderationPotentialCashPaymentMaximum / us-gaap_ContingentConsiderationByTypeAxis = xoma_DevelopmentMilestoneMember / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty5Member / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember |  |
Future milestone payments, repurchase option not exercised, maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 770,000,000 xoma_CollaborativeArrangementContingentConsiderationPotentialCashPaymentRightsNotReacquired / us-gaap_ContingentConsiderationByTypeAxis = xoma_SalesAndDevelopmentMilestoneMember / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty1Member / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of fixed-dose combination product candidates included in a portfolio of antihypertensive products from Servier |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 xoma_NumberOfFixedDoseCombinationProductCandidatesIncludedInPortfolioOfAntihypertensiveProductsFromServier / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty13Member / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
License fees paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,500,000 xoma_LicenseFeeAmountPaid / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty13Member / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Future milestone payments with each additional future qualifying product candidate development, maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,750,000 xoma_CollaborativeArrangementContingentConsiderationPotentialCashPaymentWithEachAdditionalFutureQualifyingProductCandidateDevelopment / us-gaap_ContingentConsiderationByTypeAxis = xoma_DevelopmentMilestoneMember / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty4Member / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember |  |  |  |  |  |  |  |  | 1,700,000 xoma_CollaborativeArrangementContingentConsiderationPotentialCashPaymentWithEachAdditionalFutureQualifyingProductCandidateDevelopment / us-gaap_ContingentConsiderationByTypeAxis = xoma_DevelopmentMilestoneMember / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty12Member / us-gaap_TypeOfArrangementAxis = us-gaap_NonarrangementTransactionsMember
Royalty right expiration period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years | 13 years 6 months |  |  |  |  |  |  |  | 20 years |  |  |  |  |
Proceeds from collaborators |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,200,000 us-gaap_ProceedsFromCollaborators / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty5Member / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember |  |  |  |  |
Reduction in debt under restructured agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,500,000 us-gaap_DebtInstrumentDecreaseForgiveness / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty5Member / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember |  |  |  |  |
Number of ongoing product programs with potential royalty right milestone payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 xoma_NumberOfOngoingProductProgramsWithPotentialRoyaltyRightMilestonePayments / us-gaap_ContingentConsiderationByTypeAxis = xoma_DevelopmentMilestoneMember / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty5Member / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember |  |
Maximum borrowing capacity under agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 xoma_DebtInstrumentMaximumBorrowingCapacity / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty5Member / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember |  |  |  |
Research and development expenses funded through loan facility, maximum (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75.00%xoma_CollaborativeArrangementResearchAndDevelopmentExpenseFundedThroughDebtInstrumentPercentageMaximum / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty5Member / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember |  |  |  |
Additional future milestone payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,900,000 xoma_CollaborativeArrangementContingentConsiderationAdditionalPotentialCashPayment / us-gaap_ContingentConsiderationByTypeAxis = xoma_SalesMilestoneMember / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty12Member / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember |
Number of licenses granted, minimum |  |  |  | 60 xoma_NumberOfLicensesGrantedMinimum / us-gaap_DeferredRevenueArrangementTypeAxis = us-gaap_NonsoftwareLicenseArrangementMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from license fees received |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,000,000 us-gaap_ProceedsFromLicenseFeesReceived / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty12Member / us-gaap_DeferredRevenueArrangementTypeAxis = us-gaap_NonsoftwareLicenseArrangementMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of milestone received |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 25.00%xoma_PercentageOfMilestoneReceived / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty5Member / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember |  |  |  |  |  |
Milestone received under the collaboration agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,000,000 xoma_MilestoneReceivedUnderCollaborationAgreement / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty5Member / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember |  |  |
Repayment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,750,000 xoma_LongTermDebtMaturitiesRepayment / xoma_DeferredRevenueArrangementNameOfPartyAxis = xoma_DeferredRevenueArrangementNameOfParty5Member / us-gaap_TypeOfArrangementAxis = us-gaap_CollaborativeArrangementMember |  |  |  |  |  |
Euro to US Dollar exchange rates | 1.216 us-gaap_ForeignCurrencyExchangeRateTranslation1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
- Definition Amount billed to customers under long-term contracts or programs but not paid. Excludes amounts due that have been withheld because of retainage provisions in a contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 910 -SubTopic 310 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6471494&loc=d3e49354-109356 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3(c)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 3 -Subparagraph c -Article 5 + Details
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- Definition Decrease for amounts of indebtedness forgiven by the holder of the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4 + Details
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- Definition The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.4(a).Q1) -URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6935-107765 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 13 -Section A + Details
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- Definition The net addition or reduction in the carrying amount of deferred revenue during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 13 -Section A Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.4(a).(Q1)) -URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780 + Details
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- Definition Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6897108&loc=SL6897125-166521 + Details
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- Definition Revenue from multiple-deliverable arrangements that include licensing fees and services revenue. Licensing revenue is consideration received from another party for the right to use, but not own, certain of the entity's intangible assets. Licensing arrangements include, but are not limited to, rights to use a patent, copyright, technology, manufacturing process, software or trademark. Licensing fees are generally, but not always, fixed as to amount and not dependent upon the revenue generated by the licensing party. An entity may receive licensing fees for licenses that also generate royalty payments to the entity. Services revenue may be derived by providing other, nonspecified, services during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d),(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Cash received from collaborators during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References No definition available. + Details
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- Definition Cash received from licensees for license fees during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition The amount of previously reported deferred or unearned revenue that was recognized as revenue during the period. For cash flows, this element primarily pertains to amortization of deferred credits on long-term arrangements. As a noncash item, it is deducted from net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 605 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 13.A.4(a).Q1) -URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 13 -Section A -Subsection 1 + Details
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- Definition Amount of additional potential cash payments that the Company could receive from collaborative arrangements. + References No definition available. + Details
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- Definition Refers to the maximum future development and sales milestone payments to be received by the Company. + References No definition available. + Details
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- Definition Amount of potential cash payments that the Company will receive should the Company not reacquire intangible assets produced as a result of collaborative agreements. + References No definition available. + Details
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- Definition Amount of potential cash payments that the Company could receive from collaborative arrangements for each of the additional future qualifying product candidate developed. + References No definition available. + Details
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- Definition The maximum percentage of aggregate costs of clinical research and development expenses that are funded through a debt instrument under collaborative arrangements and are not incurred by the Company. + References No definition available. + Details
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- Definition Contractual term of collaborative, licensing and other arrangements, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The maximum borrowing capacity for a debt instrument under the loan agreement. + References No definition available. + Details
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- Definition The period over which deferred or unearned revenue is recognized as revenue during the period. + References No definition available. + Details
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- Definition The aggregate amount of future initial clinical research and development expenses that will be funded by the counterparty under a collaborative arrangements. + References No definition available. + Details
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- Definition Amount paid to a licensor for license fee during the period. + References No definition available. + Details
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- Definition Refers to the timing of required repayments to its customers. + References No definition available. + Details
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- Definition Refers to the payment percentage of milestone received under the collaboration agreement. + References No definition available. + Details
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- Definition The number of fixed-dose combination ("FDC") product candidates included in a portfolio of antihypertensive products from Servier. + References No definition available. + Details
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- Definition Maximum number of licenses granted by the Company. + References No definition available. + Details
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- Definition Number of ongoing product programs with potential royalty right milestone payments. + References No definition available. + Details
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- Definition The percentage of aggregate costs of other expenses not specifically stated that are funded through collaborative arrangements and are not incurred by the Company. + References No definition available. + Details
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- Definition Refers to percentage of milestone received. + References No definition available. + Details
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- Definition Cash received from upfront payment under a license and collaboration agreement during the current period. + References No definition available. + Details
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- Definition Remaining amount deferred revenue during the reporting period. + References No definition available. + Details
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- Definition Refers to royalty right expiration period. + References No definition available. + Details
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