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v2.4.1.9

Basis of Presentation and Significant Accounting Policies (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified | 12 Months Ended | 3 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities excluded from computation of diluted net income (loss) per share (in shares) | 8,739 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 22,926 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 19,443 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |
Numerator [Abstract] |  |  |  |
Net loss before taxes, Basic | $ (38,301,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | $ (124,072,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | $ (71,139,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments |
Adjustment for revaluation of contingent warrant liabilities | (39,512,000)xoma_AmountOfDilutiveSecuritiesForRevaluationOfContingentWarrantLiabilities |  |  |
Net loss before taxes, Diluted | (77,813,000)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted |  |  |
Denominator Abstract] |  |  |  |
Weighted average shares outstanding used for basic net loss per share (in shares) | 107,435 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 86,938 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 64,629 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
Effect of dilutive warrants (in shares) | 7,898 us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants |  |  |
Weighted average shares outstanding for dilutive net loss per share (in shares) | 115,333 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 86,938 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 64,629 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |
Contract Revenue [Abstract] |  |  |  |
Decrease in previously invoiced balances from NIAID | 1,800,000 xoma_DecreaseInPreviouslyInvoicedBalancesFromNIAID |  |  |
Research and Development Expense [Abstract] |  |  |  |
Adjustment to the Company's accrued estimates for clinical trial activities from inception of the trials | 200,000 xoma_ChangesInAccountingEstimateRelatedToAdjustmentAccrual |  |  |
Restatement Adjustment [Member] |  |  |  |
Correction of an Immaterial Error [Abstract] |  |  |  |
Immaterial Error Correction |  |  |  | we concluded that correcting the error had no material impact on any of the Company's previously issued interim financial statements, would be immaterial to the fourth quarter results for 2014 and had no effect on the trend of financial results.
Decrease to operating expenses |  |  |  | (1,600,000)xoma_QuantifyingMisstatementInCurrentYearFinancialStatementsAmountOperatingExpenses / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
Decrease to net loss |  |  |  | $ (1,600,000)xoma_QuantifyingMisstatementInCurrentYearFinancialStatementsAmountNetIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
Decrease to basic loss per share (in dollar per shares) |  |  |  | $ (0.01)xoma_QuantifyingMisstatementInCurrentYearFinancialStatementsEarningsPerShareBasic / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
Decrease to diluted loss per share (in dollar per shares) |  |  |  | $ (0.02)xoma_QuantifyingMisstatementInCurrentYearFinancialStatementsEarningsPerShareDiluted / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember
Options for Common Stock [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities excluded from computation of diluted net income (loss) per share (in shares) | 6,666 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember | 7,087 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember | 5,603 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember |
Warrants for Common Stock [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Anti-dilutive securities excluded from computation of diluted net income (loss) per share (in shares) | 2,073 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_WarrantMember | 15,839 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_WarrantMember | 13,840 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_WarrantMember |
Equipment [Member] | Minimum [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Useful lives | 3 years |  |  |
Equipment [Member] | Maximum [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Useful lives | 7 years |  |  |
Leasehold Improvements, Buildings and Building Improvements [Member] | Minimum [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Useful lives | 1 year |  |  |
Leasehold Improvements, Buildings and Building Improvements [Member] | Maximum [Member] |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |
Useful lives | 15 years |  |  |

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