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

Licensing and Other Arrangements - Sale of Future Revenue Streams (Details) $ in Thousands		3 Months Ended		6 Months Ended
	Dec. 21, 2016 USD ($) agreement period	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Licensing and other arrangements
Unearned revenue recognized under units-of-revenue method				$ (970)	$ (815)
Revenue recognized under units-of-revenue method		$ 533	$ 458	970	815
Unearned revenue recognized under units-of-revenue method, current		2,029		2,029		$ 1,899
Unearned revenue recognized under units-of-revenue method, noncurrent		8,450		8,450		9,550
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		500	$ 500	1,000	$ 800
Unearned revenue recognized under units-of-revenue method, current		2,000		2,000		1,900
Unearned revenue recognized under units-of-revenue method, noncurrent		$ 8,500		$ 8,500		$ 9,600
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