XOMA Corporation Annual report pursuant to Section 13 and 15(d)

Capital Stock - Common Stock Warrants (Details)

Capital Stock - Common Stock Warrants (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended			12 Months Ended
	May 07, 2018	Mar. 31, 2019	May 31, 2018	Feb. 29, 2016	Dec. 31, 2019	Dec. 31, 2018	Mar. 04, 2019	Feb. 28, 2015
Silicon Valley Bank Loan Agreement
Warrants
Exercisable period of warrants					10 years
Common stock warrant, Exercise price $66.20 per share, Issued February 2015 \| Hercules Term Loan
Warrants
Aggregate number of unregistered shares of common stock called by warrants (in shares)								9,063
Exercise price of warrants (in dollars per share)								$ 66.20
Exercise of warrant					0
Common stock warrant, Exercise Price $15.40 per share, Issued February 2016 \| Third-party consultant
Warrants
Aggregate number of unregistered shares of common stock called by warrants (in shares)				8,249
Exercise price of warrants (in dollars per share)				$ 15.40
Exercisable period of warrants				5 years
Estimated fair value of warrants				$ 0.1
Exercise of warrant						0
Common stock warrant, Exercise price $23.69 per share, Issued May 2018 \| Silicon Valley Bank Loan Agreement
Warrants
Aggregate number of unregistered shares of common stock called by warrants (in shares)	6,332		6,332
Exercise price of warrants (in dollars per share)	$ 23.69		$ 23.69
Exercisable period of warrants	10 years		10 years
Estimated fair value of warrants	$ 0.1		$ 0.1
Common stock warrant, Exercise price $14.71 per share, Issued March 2019 \| Silicon Valley Bank Loan Agreement
Warrants
Aggregate number of unregistered shares of common stock called by warrants (in shares)		4,845					4,845
Exercise price of warrants (in dollars per share)		$ 14.71					$ 14.71
Exercisable period of warrants		10 years
Estimated fair value of warrants		$ 0.1					$ 0.1
Exercise of warrant					0