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Fair Value Measurements, Warrant Liabilities, Changes in Level 3, and Outstanding Debt (Details) (USD $)
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3 Months Ended |
12 Months Ended |
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Mar. 31, 2015
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Mar. 31, 2014
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Dec. 31, 2014
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| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
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| Reclassification of contingent warrant liability to equity upon exercise of warrants |
$ 0xoma_ReclassificationOfContingentWarrantLiabilityToEquityExerciseOfWarrants
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$ (2,525,000)xoma_ReclassificationOfContingentWarrantLiabilityToEquityExerciseOfWarrants
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| Carrying Value [Member] |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Outstanding debt |
47,189,000us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
|
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35,308,000us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
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| Fair Value [Member] |
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| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
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| Outstanding debt |
47,668,000us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
|
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36,461,000us-gaap_DebtInstrumentFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
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| Warrant Liabilities [Member] |
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| Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |
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| Risk-free interest rate (in hundredths) |
0.55%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_FairValueByLiabilityClassAxis
= xoma_ContingentWarrantLiabilitiesMember
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| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
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| Beginning balance |
31,828,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByLiabilityClassAxis
= xoma_ContingentWarrantLiabilitiesMember
|
69,869,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByLiabilityClassAxis
= xoma_ContingentWarrantLiabilitiesMember
|
69,869,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByLiabilityClassAxis
= xoma_ContingentWarrantLiabilitiesMember
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| Reclassification of contingent warrant liability to equity upon exercise of warrants |
0xoma_ReclassificationOfContingentWarrantLiabilityToEquityExerciseOfWarrants
/ us-gaap_FairValueByLiabilityClassAxis
= xoma_ContingentWarrantLiabilitiesMember
|
(2,525,000)xoma_ReclassificationOfContingentWarrantLiabilityToEquityExerciseOfWarrants
/ us-gaap_FairValueByLiabilityClassAxis
= xoma_ContingentWarrantLiabilitiesMember
|
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| Net increase (decrease) in estimated fair value of contingent warrant liabilities upon revaluation |
40,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_FairValueByLiabilityClassAxis
= xoma_ContingentWarrantLiabilitiesMember
|
(20,002,000)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_FairValueByLiabilityClassAxis
= xoma_ContingentWarrantLiabilitiesMember
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| Ending balance |
31,868,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByLiabilityClassAxis
= xoma_ContingentWarrantLiabilitiesMember
|
47,342,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_FairValueByLiabilityClassAxis
= xoma_ContingentWarrantLiabilitiesMember
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| Warrant Liabilities [Member] | Minimum [Member] |
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| Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |
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| Expected volatility (in hundredths) |
73.90%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FairValueByLiabilityClassAxis
= xoma_ContingentWarrantLiabilitiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
|
|
69.60%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FairValueByLiabilityClassAxis
= xoma_ContingentWarrantLiabilitiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
|
| Risk-free interest rate (in hundredths) |
|
|
0.03%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_FairValueByLiabilityClassAxis
= xoma_ContingentWarrantLiabilitiesMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
|
| Expected term |
1 year 8 months 8 days
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0 years 1 month 2 days
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| Warrant Liabilities [Member] | Maximum [Member] |
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| Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |
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| Expected volatility (in hundredths) |
74.80%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FairValueByLiabilityClassAxis
= xoma_ContingentWarrantLiabilitiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
|
|
72.90%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_FairValueByLiabilityClassAxis
= xoma_ContingentWarrantLiabilitiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
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| Risk-free interest rate (in hundredths) |
|
|
0.67%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_FairValueByLiabilityClassAxis
= xoma_ContingentWarrantLiabilitiesMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
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| Expected term |
1 year 11 months 8 days
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2 years 2 months 8 days
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| Foreign Exchange Option [Member] | Maximum [Member] |
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| Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |
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| Estimated fair value of the foreign exchange options |
$ 100us-gaap_ForeignCurrencyContractAssetFairValueDisclosure
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeOptionMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
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