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

Capital Stock - Dividends (Details) - USD ($) $ / shares in Units, $ in Thousands	Apr. 15, 2022	Mar. 17, 2022	Jan. 18, 2022	Oct. 20, 2021	Apr. 09, 2021	Dec. 15, 2020	Mar. 31, 2022	Dec. 31, 2021
Dividends
Restricted cash							$ 837	$ 2,049
8.625% Series A Cumulative, Perpetual Preferred Stock
Dividends
Cash dividend declared (in dollars per share)		$ 0.53906		$ 0.53906
Cash dividend paid (in dollars per share)			$ 0.53906
Issuance of stock, net (in shares)						984,000
Series B Depositary Shares
Dividends
Cash dividend declared (in dollars per share)		$ 0.52344		$ 0.52344
Cash dividend paid (in dollars per share)			$ 0.52344
Issuance of stock, net (in shares)					1,600,000
Subsequent Event \| 8.625% Series A Cumulative, Perpetual Preferred Stock
Dividends
Cash dividend paid (in dollars per share)	$ 0.53906
Subsequent Event \| Series B Depositary Shares
Dividends
Cash dividend paid (in dollars per share)	$ 0.52344