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

Annual report pursuant to Section 13 and 15(d)

Licensing and Other Arrangements - Rezolute - First Amendment (Details)

Licensing and Other Arrangements - Rezolute - First Amendment (Details) $ in Thousands				1 Months Ended			3 Months Ended								10 Months Ended	12 Months Ended					13 Months Ended
	Jan. 30, 2019 USD ($)	Jan. 07, 2019 USD ($)	Apr. 03, 2018 USD ($) shares	Mar. 31, 2019 USD ($)	Apr. 30, 2018 USD ($) shares	Mar. 31, 2018 USD ($) item shares	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2018 shares	Dec. 31, 2020 shares	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) shares	Dec. 31, 2019 shares	Dec. 31, 2018 USD ($)	Mar. 31, 2019 USD ($)
Licensing and other arrangements
Revenues							$ 422	$ 8,855	$ 962	$ 8,131	$ 1,685	$ 896	$ 2,255	$ 463				$ 18,370		$ 5,299
Revenue from contracts with customers																		$ 17,276		5,068
Rezolute \| License Agreement and Common Stock Purchase Agreement
Licensing and other arrangements
Amount of cash eligible to receive						$ 6,000
Amount of Rezolute's common stock eligible to receive		$ 8,500				$ 8,500															$ 8,500
Number of Rezolute's common stock eligible to receive contingent on completion of financing activities \| shares						7,000,000
Gross proceeds to be raised for qualified financing																					$ 20,000
Common stock trading period																					10 days
Number of Rezolute's shares Company has right and option to sell if Rezolute does not list common stock shares on national exchange \| shares																		5,000,000
Revenues														$ 0
Transaction price, Shares received (in shares) \| shares			8,093,010
Transaction price, cash consideration			$ 500
Reimbursable technology transfer expense received	$ 300		300
Number of arrangements \| item						1
Number of performance obligations \| item						1
Transaction price			1,800
Transaction price, Value of common stock received			$ 1,000
Revenue from contracts with customers				$ 2,500				$ 6,000					$ 1,800					$ 14,000		$ 1,800
Rezolute \| License Agreement and Common Stock Purchase Agreement \| Forecast
Licensing and other arrangements
Eligible to receive, in order to maintain license agreement																	$ 15,000
Rezolute \| License Agreement
Licensing and other arrangements
Reimbursable technology transfer expense received					$ 300
Rezolute \| Common Stock Purchase Agreement
Licensing and other arrangements
Number of Rezolute's shares Company has right and option to sell if Rezolute does not list common stock shares on national exchange \| shares															5,000,000				5,000,000
Percent of Rezolute's shares held Company has right and option to sell if Rezolute does not list common stock shares on national exchange															33.33%
Transaction price, Shares received (in shares) \| shares					8,093,010
Transaction price, cash consideration					$ 500
Rezolute \| Common Stock Purchase Agreement \| Forecast
Licensing and other arrangements
Number of Rezolute's shares Company has right and option to sell if Rezolute does not list common stock shares on national exchange \| shares																2,500,000