XML 104 R95.htm IDEA: XBRL DOCUMENT
v3.20.1

Capital Stock - Common Stock Warrants (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 07, 2018 | Mar. 31, 2019 | May 31, 2018 | Feb. 29, 2016 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 04, 2019 | Feb. 28, 2015
Silicon Valley Bank Loan Agreement |  |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |  |
Exercisable period of warrants |  |  |  |  | 10 years |  |  |
Common stock warrant, Exercise price $66.20 per share, Issued February 2015 | Hercules Term Loan |  |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |  |
Aggregate number of unregistered shares of common stock called by warrants (in shares) |  |  |  |  |  |  |  | 9,063
Exercise price of warrants (in dollars per share) |  |  |  |  |  |  |  | $ 66.20
Exercise of warrant |  |  |  |  | 0 |  |  |
Common stock warrant, Exercise Price $15.40 per share, Issued February 2016 | Third-party consultant |  |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |  |
Aggregate number of unregistered shares of common stock called by warrants (in shares) |  |  |  | 8,249 |  |  |  |
Exercise price of warrants (in dollars per share) |  |  |  | $ 15.40 |  |  |  |
Exercisable period of warrants |  |  |  | 5 years |  |  |  |
Estimated fair value of warrants |  |  |  | $ 0.1 |  |  |  |
Exercise of warrant |  |  |  |  |  | 0 |  |
Common stock warrant, Exercise price $23.69 per share, Issued May 2018 | Silicon Valley Bank Loan Agreement |  |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |  |
Aggregate number of unregistered shares of common stock called by warrants (in shares) | 6,332 |  | 6,332 |  |  |  |  |
Exercise price of warrants (in dollars per share) | $ 23.69 |  | $ 23.69 |  |  |  |  |
Exercisable period of warrants | 10 years |  | 10 years |  |  |  |  |
Estimated fair value of warrants | $ 0.1 |  | $ 0.1 |  |  |  |  |
Common stock warrant, Exercise price $14.71 per share, Issued March 2019 | Silicon Valley Bank Loan Agreement |  |  |  |  |  |  |  |
Warrants |  |  |  |  |  |  |  |
Aggregate number of unregistered shares of common stock called by warrants (in shares) |  | 4,845 |  |  |  |  | 4,845 |
Exercise price of warrants (in dollars per share) |  | $ 14.71 |  |  |  |  | $ 14.71 |
Exercisable period of warrants |  | 10 years |  |  |  |  |  |
Estimated fair value of warrants |  | $ 0.1 |  |  |  |  | $ 0.1 |
Exercise of warrant |  |  |  |  | 0 |  |  |

X
- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Fair value portion of warrants not settleable in cash classified as equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_WarrantsNotSettleableInCashFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the exercisable period for warrants beginning on the date of issuance, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | xoma_ExercisablePeriodOfWarrants
Namespace Prefix: | xoma_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Shares of stock issued as a result of the exercise of warrants. + References No definition available. + Details
Name: | xoma_StockIssuedDuringPeriodSharesWarrantsExercised
Namespace Prefix: | xoma_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DebtInstrumentAxis=xoma_SiliconValleyBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_DebtInstrumentAxis=xoma_HerculesTermLoanMember
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: | srt_CounterpartyNameAxis=xoma_ThirdPartyConsultantMember
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: |