v3.25.4

Document and Entity Information	Nov. 21, 2025
Document And Entity Information [Line Items]
Entity Registrant Name	XOMA Royalty Corp
Amendment Flag	true
Entity Central Index Key	0000791908
Document Type	8-K/A
Document Period End Date	Nov. 21, 2025
Entity Incorporation State Country Code	NV
Entity File Number	001-39801
Entity Tax Identification Number	52-2154066
Entity Address, Address Line One	2200 Powell Street
Entity Address, Address Line Two	Suite 310
Entity Address, City or Town	Emeryville
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94608
City Area Code	(510)
Local Phone Number	204-7200
Written Communications	false
Soliciting Material	false
Pre Commencement Tender Offer	false
Pre Commencement Issuer Tender Offer	false
Entity Emerging Growth Company	false
Amendment Description	This Current Report on Form 8-K/A is being filed as a supplement to the Current Report on Form 8-K filed by XOMA Royalty Corporation on November 21, 2025 to disclose additional information regarding the Legacy Assets of LAVA (as such terms are defined below).
Common Stock [Member]
Document And Entity Information [Line Items]
Security 12b Title	Common Stock, $0.0075 par value
Trading Symbol	XOMA
Security Exchange Name	NASDAQ
M 8.625 Series A Cumulative Perpetual Preferred Stock Par Value 0.05 Per Share [Member]
Document And Entity Information [Line Items]
Security 12b Title	8.625% Series A Cumulative Perpetual Preferred Stock, par value $0.05 per share
Trading Symbol	XOMAP
Security Exchange Name	NASDAQ
Depositary Shares Each Representing 11000th Interest In A Share Of 8.375 Series B Cumulative Perpetual Preferred Stock Par Value 0.05 Per Share [Member]
Document And Entity Information [Line Items]
Security 12b Title	Depositary Shares (each representing 1/1000th interest in a share of 8.375% Series B Cumulative Perpetual Preferred Stock, par value $0.05 per share)
Trading Symbol	XOMAO
Security Exchange Name	NASDAQ

Description of changes contained within amended document.

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For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD.

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The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.

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Address Line 1 such as Attn, Building Name, Street Name

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Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.

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XOMA Royalty Corp 8-K/A