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							9 Months Ended		12 Months Ended
	Mar. 31, 2020 USD ($) installment	Sep. 30, 2019 USD ($)	Jan. 30, 2019 USD ($)	Jan. 07, 2019 USD ($) item	Apr. 03, 2018 USD ($)	Oct. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($) shares	Aug. 31, 2019 USD ($) item	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	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											$ 200				$ 8,525		$ 753	$ 17,176
Provision for bad debt																	1,409
Bad debt allowance											1,409						1,409
Subsequent Event \| Forecast
Licensing and other arrangements
Provision for bad debt										$ (1,400)
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	$ 400	$ 400	$ 1,000	$ 4,900
Upfront consideration to incremental discount for future payment					0
Contract assets											0			0			0			$ 0
Contract liabilities											0			0			0			0
Capitalized contract costs											0			$ 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						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
Bad debt allowance											$ 1,400						$ 1,400
Rezolute \| License Agreement \| Subsequent Event
Licensing and other arrangements
Future cash payments received						$ 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