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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 | ||
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2014
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| 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) | 8,739us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 22,926us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 19,443us-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) | 107,435us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 86,938us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 64,629us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | |
| Effect of dilutive warrants (in shares) | 7,898us-gaap_IncrementalCommonSharesAttributableToCallOptionsAndWarrants | |||
| Weighted average shares outstanding for dilutive net loss per share (in shares) | 115,333us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 86,938us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 64,629us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | |
| Contract Revenue [Abstract] | ||||
| Decrease in previously invoiced balances from NIAID | 1,800,000xoma_DecreaseInPreviouslyInvoicedBalancesFromNIAID | |||
| Research and Development Expense [Abstract] | ||||
| Adjustment to the Company's accrued estimates for clinical trial activities from inception of the trials | 200,000xoma_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 |
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| Decrease to net loss |
$ (1,600,000)xoma_QuantifyingMisstatementInCurrentYearFinancialStatementsAmountNetIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |
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| Decrease to basic loss per share (in dollar per shares) |
$ (0.01)xoma_QuantifyingMisstatementInCurrentYearFinancialStatementsEarningsPerShareBasic / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |
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| Decrease to diluted loss per share (in dollar per shares) |
$ (0.02)xoma_QuantifyingMisstatementInCurrentYearFinancialStatementsEarningsPerShareDiluted / us-gaap_StatementScenarioAxis = us-gaap_RestatementAdjustmentMember |
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| 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) |
6,666us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember |
7,087us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember |
5,603us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_EmployeeStockOptionMember |
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| 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) |
2,073us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_WarrantMember |
15,839us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_WarrantMember |
13,840us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount / us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis = us-gaap_WarrantMember |
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| 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 | |||
| X | ||||||||||
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- Definition
Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Describes nature and related effect on financial statements related to corrections of prior year errors in the current year financial statements when the effect of the prior year error was immaterial to the prior year financial statements and the current year correction is immaterial to the current year financial statements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. No definition available.
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- Definition
The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the revaluation of contingent warrant liabilities. No definition available.
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Amount of changes in accounting estimate related to adjustment accrual during the period. No definition available.
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Refers to the decrease in previously invoiced balances from NIAID. No definition available.
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Amount of net income (loss) errors being corrected in the correcting adjustment. No definition available.
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Amount of operating expense errors being corrected in the correcting adjustment. No definition available.
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Amount of earnings per share basic errors being corrected in the correcting adjustment. No definition available.
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Amount of earnings per share diluted errors being corrected in the correcting adjustment. No definition available.
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