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Royalty Purchase Agreements (Tables) | 6 Months Ended
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Jun. 30, 2021
Royalty Purchase Agreements |
Summary of Acquisition of Royalty Rights | The following table summarizes the long-term royalty receivable activities including acquisitions of royalty rights during the six months ended June 30, 2021 (in thousands):
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Balance at December 31, 2020 |  | $ | 34,575
Acquisition of royalty rights: | ​ | ​ | ​
Viracta | ​ |  | 13,500
Balance at June 30, 2021 | ​ | $ | 48,075

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- Definition Royalty purchase agreement. + References No definition available. + Details
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Namespace Prefix: | xoma_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Schedule of royalty rights. + References No definition available. + Details
Name: | xoma_ScheduleOfRoyaltyRightsTableTextBlock
Namespace Prefix: | xoma_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration