XML 27 R93.htm IDEA: XBRL DOCUMENT
v3.20.1

Capital Stock - Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Millions | 1 Months Ended |
--- | --- | ---
Feb. 28, 2017 | Dec. 31, 2018
Series X and Series Y Convertible Preferred Stock |  |
Sale of stock |  |
Number of shares issued for each share of convertible preferred stock that is converted |  | 1,000
Series X Convertible Preferred Stock |  |
Sale of stock |  |
Preferred stock conversion price per share |  | $ 4.03
Fair value of common stock amount exceeded purchase price of convertible preferred stock | $ 5.6 |
Series Y Convertible Preferred Stock |  |
Sale of stock |  |
Preferred stock conversion price per share |  | $ 13.00

X
- Definition Number of shares issued for each share of convertible preferred stock that is converted. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(27)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21506-112644 + Details
Name: | us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
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_SubsidiarySaleOfStockLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value of common stock amount exceeded allocated purchase price of convertible preferred stock. + References No definition available. + Details
Name: | xoma_FairValueOfCommonStockAmountExceededAllocatedPurchasePriceOfConvertiblePreferredStock
Namespace Prefix: | xoma_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Preferred stock conversion price per share. + References No definition available. + Details
Name: | xoma_PreferredStockConversionPricePerShare
Namespace Prefix: | xoma_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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

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

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