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 - 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	10 Months Ended	12 Months Ended				13 Months Ended
	Oct. 09, 2020 USD ($)	Mar. 31, 2020 installment	Jan. 30, 2019 USD ($)	Jan. 07, 2019 USD ($) payment	Apr. 03, 2018 USD ($)	Oct. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Apr. 30, 2018 USD ($)	Mar. 31, 2018 USD ($) item	Aug. 31, 2019 USD ($) item	Dec. 31, 2020 USD ($) shares	Sep. 30, 2020 USD ($) shares	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2018 shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($)	Mar. 31, 2019 USD ($)	Jun. 30, 2019 USD ($)
Licensing and other arrangements
Revenue from contracts with customers																			$ 27,941		$ 17,276
Future cash payments of revenue recognized																			$ 2,600
Rezolute \| Private Placement
Licensing and other arrangements
Aggregate gross proceeds from issuance of stock	$ 41,000
Rezolute
Licensing and other arrangements
Number of shares owned \| shares											161,860	8,093,010							161,860
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		$ 8,500
Additional common stock to be received if Rezolute did not complete financing																							$ 8,500
Number of future cash payments to be received \| payment				5
Amount of future cash payments to be received				$ 8,500
Percentage of net proceeds of each future financing upon closing of the qualified financing				15.00%
Number of Rezolute's shares Company has right and option to sell if Rezolute does not list common stock shares on national exchange \| shares																			100,000
Gross proceeds received by third party from preferred stock financing			$ 25,000
Consideration received following qualified financing event			5,500																		5,500
Reimbursable technology transfer expense received			$ 300		$ 300
Revenue from contracts with customers							2,500									$ 6,000	$ 14,000		$ 0		14,000	$ 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
Number of performance obligations \| item									1
Future cash payments of revenue recognized																					$ 8,500
Provision for bad debt														$ 1,400
Contract assets											$ 0								0
Contract liabilities											0								0
Capitalized contract costs											0								0
Rezolute \| License Agreement and Common Stock Purchase Agreement \| Maximum
Licensing and other arrangements
Amount of future cash payments to be received				$ 8,500
Rezolute \| License Agreement
Licensing and other arrangements
Amount of future cash payments to be received											2,600								$ 2,600
Reimbursable technology transfer expense received								$ 300
Future cash payments received						$ 1,400
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
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	2,500,000	5,000,000
Number of Rezolute's post-split shares Company has right and option to sell \| shares																			50,000		100,000