Annual report pursuant to Section 13 and 15(d)

Document and Entity Information

Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2021
Mar. 03, 2022
Jun. 30, 2021
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2021    
Document Transition Report false    
Entity File Number 001-39801    
Entity Registrant Name XOMA CORPORATION    
Entity Incorporation State Country Code DE    
Entity Tax Identification Number 52-2154066    
Entity Address Address Line1 2200 Powell Street    
Entity Address Address Line2 Suite 310    
Entity Address City Or Town Emeryville    
Entity Address State Or Province CA    
Entity Address Postal Zip Code 94608    
City Area Code 510    
Local Phone Number 204-7200    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag false    
Entity Shell Company false    
Entity Public Float     $ 240,018,070
Entity Common Stock, Shares Outstanding   11,319,124  
Auditor Firm ID 34    
Auditor Name DELOITTE & TOUCHE LLP    
Auditor Location San Francisco, California    
Entity Central Index Key 0000791908    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2021    
Document Fiscal Period Focus FY    
Amendment Flag false    
Common Stock      
Security12b Title Common Stock, $0.0075 par value    
Trading Symbol XOMA    
Security Exchange Name NASDAQ    
8.625% Series A Cumulative, Perpetual Preferred Stock      
Security12b Title 8.625% Series A Cumulative, Perpetual Preferred Stock, par value $0.05    
Trading Symbol XOMAP    
Security Exchange Name NASDAQ    
Series B Depositary Shares      
Security12b Title Depositary Shares (each representing 1/1000th interest in a share of 8.375% Series B Cumulative Perpetual Preferred Stock, par value $0.05)    
Trading Symbol XOMAO    
Security Exchange Name NASDAQ