XML 88 R77.htm IDEA: XBRL DOCUMENT
v3.23.2

Capital Stock - ATM Agreements (Details) - USD ($) $ in Millions |  |  |  | 20 Months Ended | 51 Months Ended
--- | --- | --- | --- | --- | ---
Aug. 05, 2021 | Mar. 10, 2021 | Dec. 18, 2018 | Mar. 31, 2023 | Mar. 31, 2023
2018 Common Stock ATM Agreement | Common Stock |  |  |  |  |
Sale of stock |  |  |  |  |
Shares issued (in shares) |  |  |  |  | 0
Maximum amount of shares to be issued |  | $ 50.0 | $ 30.0 |  |
2018 Common Stock ATM Agreement | Common Stock | Maximum |  |  |  |  |
Sale of stock |  |  |  |  |
Sales commission paid per transaction (as a percent) |  |  | 3.00% |  |
2021 ATM Agreement | Series B Depositary Shares |  |  |  |  |
Sale of stock |  |  |  |  |
Shares issued (in shares) |  |  |  | 0 |
Maximum amount of shares to be issued | $ 50.0 |  |  |  |
2021 ATM Agreement | Series B Depositary Shares | Maximum |  |  |  |  |
Sale of stock |  |  |  |  |
Sales commission paid per transaction, preferred stock (as a percent) | 3.00% |  |  |  |

X
- Definition Number of new stock issued during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -SubTopic 10 -Topic 505 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481004/946-505-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-09(4)(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483575/946-220-S99-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.6-03(i)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479886/946-10-S99-3 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_StockIssuedDuringPeriodSharesNewIssues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Maximum amount of stock to be issued. + References No definition available. + Details
Name: | xoma_MaximumValueOfStockToBeIssued
Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The percentage of sales commission to gross proceeds paid to sales agents for the sale of the Company's common shares. + References No definition available. + Details
Name: | xoma_PercentageOfGrossProceedsPaidToAgentForSaleOfCommonShares
Namespace Prefix: | xoma_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of sales commission to gross proceeds paid to sales agents for the sale of the Company's shares. + References No definition available. + Details
Name: | xoma_PercentageOfGrossProceedsPaidToAgentForSaleOfShares
Namespace Prefix: | xoma_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=xoma_TwoThousandEighteenAtMarketAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsidiarySaleOfStockAxis=xoma_AtMarketIssuanceSalesAgreement2021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=dei_AdrMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |