0000791908 2026-05-21 2026-05-21 0000791908 us-gaap:CommonStockMember 2026-05-21 2026-05-21 0000791908 xoma:M8.625SeriesACumulativePerpetualPreferredStockParValue0.05PerShareMember 2026-05-21 2026-05-21 0000791908 xoma:DepositarySharesEachRepresenting11000thInterestInAShareOf8.375SeriesBCumulativePerpetualPreferredStockParValue0.05PerShareMember 2026-05-21 2026-05-21 XOMA Royalty Corp false 0000791908 --12-31 8-K 2026-05-21 NV 001-39801 52-2154066 2200 Powell Street Suite 310 Emeryville CA 94608 (510) 204-7200 false false false false Common Stock, $0.0075 par value XOMA NASDAQ 8.625% Series A Cumulative Perpetual Preferred Stock, par value $0.05 per share XOMAP NASDAQ 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) XOMAO NASDAQ false