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Description of Business
 12 Months Ended
Dec. 31, 2012
Description of Business [Abstract]  
Description of Business
1.
Description of Business

XOMA Corporation ("XOMA" or the "Company"), a Delaware corporation combines a portfolio of late-stage clinical programs and research activities to develop innovative therapeutic antibodies with its recently launched commercial operations. The Company's products are presently in various stages of development and most are subject to regulatory approval before they can be commercially launched.