XML 78 R65.htm IDEA: XBRL DOCUMENT
v3.20.2

Common Stock Warrants (Details) - $ / shares | Sep. 30, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | May 31, 2018 | Feb. 29, 2016 | Feb. 28, 2015
--- | --- | --- | --- | --- | --- | ---
Warrants |  |  |  |  |  |
Aggregate number of unregistered shares of common stock called by warrants (in shares) | 19,426 | 28,489 |  |  |  |
Common stock warrant, Exercise price $66.20 per share, Issued February 2015 |  |  |  |  |  |
Warrants |  |  |  |  |  |
Exercise price of warrants (in dollars per share) |  |  |  |  |  | $ 66.20
Aggregate number of unregistered shares of common stock called by warrants (in shares) |  |  |  |  |  | 9,063
Common stock warrant, Exercise Price $15.40 per share, Issued February 2016 |  |  |  |  |  |
Warrants |  |  |  |  |  |
Exercise price of warrants (in dollars per share) |  |  |  |  | $ 15.40 |
Aggregate number of unregistered shares of common stock called by warrants (in shares) |  |  |  |  | 8,249 |
Common stock warrant, Exercise price $23.69 per share, Issued May 2018 |  |  |  |  |  |
Warrants |  |  |  |  |  |
Exercise price of warrants (in dollars per share) |  |  |  | $ 23.69 |  |
Aggregate number of unregistered shares of common stock called by warrants (in shares) |  |  |  | 6,332 |  |
Common stock warrant, Exercise price $14.71 per share, Issued March 2019 |  |  |  |  |  |
Warrants |  |  |  |  |  |
Exercise price of warrants (in dollars per share) |  |  | $ 14.71 |  |  |
Aggregate number of unregistered shares of common stock called by warrants (in shares) |  |  | 4,845 |  |  |

X
- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
Name: | us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 + Details
Name: | us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=xoma_FiveYearWarrantsIssuedFirstRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=xoma_FiveYearWarrantsIssuedSecondRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=xoma_TenYearWarrantsIssuedThirdRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightAxis=xoma_CommonStockWarrantExercisePrice14.71Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |