XOMA Royalty Corporation Annual report [Section 13 and 15(d), not S-K Item 405]

Royalty and Commercial Payment Purchase Agreements - EIR Method - Affitech (Details)

Royalty and Commercial Payment Purchase Agreements - EIR Method - Affitech (Details) - USD ($) $ in Thousands			3 Months Ended	12 Months Ended
	Apr. 01, 2024	Oct. 06, 2021	Mar. 31, 2024	Dec. 31, 2024	Dec. 31, 2023
Agreements
Payments of consideration under RPAs, AAAs and CPPAs				$ 53,000	$ 14,650
Acquisition of royalty and commercial payment receivables				45,000
Contingent consideration under RPAs, AAAs, and CPPAs				3,000	7,000
Royalty and commercial payment receivables under the EIR method				19,733
Reclassification of royalty and commercial payment receivables from the cost recovery to the EIR method, EIR method				14,976
Short-term royalty and commercial payment receivables under the EIR method				14,763	0
Income from purchased receivables under the EIR method				15,066
Receipts under RPAs, AAAs, and CPPAs				29,248	13,956
Affitech
Agreements
Royalty and commercial payment receivables under the EIR method				13,105
Reclassification of royalty and commercial payment receivables from the cost recovery to the EIR method, EIR method				7,795
Income from purchased receivables under the EIR method				$ 14,800
Affitech \| Commercial Payment Purchase Agreement
Agreements
Payments of consideration under RPAs, AAAs and CPPAs		$ 6,000
Payments eligible to receive (as a percent)		0.50%
Commercial payment receivable term		10 years
Acquisition of royalty and commercial payment receivables		$ 14,000
Maximum commercial sales milestone payments		12,000
Period from each royalty payment date payment is due				60 days
Reclassification of royalty and commercial payment receivables from the cost recovery to the EIR method, EIR method	$ 7,800
Income from purchased receivables under the EIR method				$ 14,800
Receipts under RPAs, AAAs, and CPPAs				16,900
Allowance for credit losses				0	0
Affitech \| Commercial Payment Purchase Agreement \| Regulatory milestones
Agreements
Contingent consideration under RPAs, AAAs, and CPPAs		8,000
Affitech \| Commercial Payment Purchase Agreement \| Regulatory milestones \| United States
Agreements
Payments of consideration under RPAs, AAAs and CPPAs		5,000
Affitech \| Commercial Payment Purchase Agreement \| Regulatory milestones \| Europe
Agreements
Payments of consideration under RPAs, AAAs and CPPAs		$ 3,000
Affitech \| Commercial Payment Purchase Agreement \| Sales-based milestones, first and second
Agreements
Payments of consideration under RPAs, AAAs and CPPAs			$ 6,000
Contingent consideration under RPAs, AAAs, and CPPAs			0		$ 6,000
Affitech \| Commercial Payment Purchase Agreement \| Sales-based milestones, third
Agreements
Contingent consideration under RPAs, AAAs, and CPPAs			$ 3,000	$ 3,000