XOMA Corporation Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

Licensing and Other Arrangements - Rezolute - Second and Third Amendments (Details)

Licensing and Other Arrangements - Rezolute - Second and Third Amendments (Details) $ in Thousands						1 Months Ended		2 Months Ended	3 Months Ended				12 Months Ended
	Sep. 30, 2019 USD ($)	Jan. 30, 2019 USD ($)	Jan. 07, 2019 USD ($) item	Apr. 03, 2018 USD ($)	Dec. 06, 2017 shares	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Aug. 31, 2019 USD ($) item	Mar. 31, 2020 USD ($) installment	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($)	Jun. 30, 2019 USD ($)
Licensing and other arrangements
Revenue from contracts with customers									$ 500			$ 8,026
Provision for bad debt									1,409
Rezolute \| License Agreement and Common Stock Purchase Agreement
Licensing and other arrangements
Amount of Rezolute's common stock eligible to receive			$ 8,500				$ 8,500
Number of future cash payments upon closing of the qualified financing \| item			5
Future cash payments upon closing of the qualified financing			$ 8,500									8,500
Percentage of net proceeds of each future financing upon closing of the qualified financing			15.00%
Gross proceeds received by third party from preferred stock financing		$ 25,000
Consideration received following qualified financing event		5,500
Reimbursable technology transfer expense received		$ 300		$ 300
Revenue from contracts with customers						$ 2,500					$ 6,000				$ 1,800
Doubtful revenue reversal of future cash payments						$ 2,500		$ 3,600				$ 2,500
Number of common stock financing events \| item								2
Early payment of unrecognized future cash payments								$ 3,400
Unrecognized future cash payments																$ 6,000
Future cash payments received	$ 1,500								400	$ 1,000	$ 4,900
Upfront consideration to incremental discount for future payment				0
Outstanding receivable									800
Contract assets									0	0				$ 0
Contract liabilities									0	0				0
Capitalized contract costs									0	$ 0				$ 0
Rezolute \| License Agreement and Common Stock Purchase Agreement \| Maximum
Licensing and other arrangements
Future cash payments of revenue recognized			$ 8,500
Rezolute \| License Agreement
Licensing and other arrangements
Reimbursable technology transfer expense received				$ 300
Revenue from contracts with customers									0
Future cash payments of revenue recognized									$ 2,600
Number of quarterly payments \| installment									7
Payment period following closing of Qualified Financing									15 days
Provision for bad debt									$ 1,400
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
Rezolute \| Common Stock Purchase Agreement \| Forecast \| Maximum
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