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		3 Months Ended					12 Months Ended
	Oct. 09, 2020 USD ($)	Mar. 31, 2020 USD ($) installment	Jan. 30, 2019 USD ($)	Jan. 07, 2019 USD ($) item shares	Apr. 03, 2018 USD ($)	Oct. 31, 2020 USD ($) shares	Mar. 31, 2018 USD ($) shares	Mar. 31, 2021 USD ($)	Dec. 31, 2020 USD ($) shares	Sep. 30, 2020 USD ($) shares	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($)	Mar. 31, 2019 USD ($)
Licensing and other arrangements
Revenue from contracts with customers								$ 19				$ 500
Provision for bad debt												1,409
Rezolute
Licensing and other arrangements
Reverse stock split						0.02			0.02
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			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
Number of future cash payments to be received \| item				5
Amount of future cash payments to be received				$ 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
Revenue from contracts with customers														$ 8,500	$ 1,800
Future cash payments received						$ 1,400				$ 400	$ 400	400		$ 5,900
Upfront consideration to incremental discount for future payment					$ 0
Provision for bad debt									$ (1,400)			1,400
Bad debt allowance										$ 1,400
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
Amount of future cash payments to be received				$ 8,500
Rezolute \| License Agreement
Licensing and other arrangements
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
Rezolute \| Common Stock Purchase Agreement
Licensing and other arrangements
Number of Rezolute's shares Company has right and option to sell \| shares				5,000,000			5,000,000							100,000
Number of Rezolute's post-split shares Company has right and option to sell \| shares				100,000									50,000
Rezolute \| Common Stock Purchase Agreement \| Maximum
Licensing and other arrangements
Number of Rezolute's shares Company has right and option to sell \| shares													2,500,000