XOMA Corporation Quarterly report pursuant to Section 13 or 15(d)

Acquisitions, Licensing and Other Arrangements - Sale of Future Revenue Streams (Details) $ in Thousands		3 Months Ended		9 Months Ended
	Dec. 21, 2016 USD ($) agreement period	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Licensing and other arrangements
Unearned revenue recognized under units-of-revenue method				$ (1,828)	$ (1,575)
Revenue recognized under units-of-revenue method		$ 709	$ 605	1,828	1,575
Unearned revenue recognized under units-of-revenue method, current		1,924		1,924		$ 2,113
Unearned revenue recognized under units-of-revenue method, noncurrent		5,589		5,589		7,228
HealthCare Royalty Partners II, L.P. \| Royalty Sale Agreements
Licensing and other arrangements
Number of agreements \| agreement	2
Unearned revenue recognized under units-of-revenue method	$ 18,000
Revenue recognized under units-of-revenue method		$ 700	$ 600	$ 1,800	$ 1,600
Unearned revenue recognized under units-of-revenue method, current						2,100
Unearned revenue recognized under units-of-revenue method, noncurrent						$ 7,200
HealthCare Royalty Partners II, L.P. \| First Royalty Sale Agreement
Licensing and other arrangements
Cash payment received	6,500
Eligible potential additional payments receivable upon achievement of specified net sales milestones in future years	$ 4,000
Number of milestone periods \| period	3
HealthCare Royalty Partners II, L.P. \| Second Royalty Sale Agreement
Licensing and other arrangements
Cash payment received	$ 11,500