CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Statement [Abstract]
Royalty revenue		$ 3,114
Revenue from Contract with Customer, Product and Service [Extensible List]	us-gaap:RoyaltyMember	us-gaap:RoyaltyMember
Operating expenses:
Research and development	$ (17,107)	$ (17,882)
General and administrative	(11,771)	(13,873)
Loss from operations	(28,878)	(28,641)
Other income (expense):
Other income (expense) from continuing operations, net	578	(4,027)
Gain related to sale of non-financial asset	9,650
Gain on extinguishment of liability related to sale of royalties		37,182
Milestone income related to sale of royalties		2,500
Net (loss) income from continuing operations	(18,650)	7,014
Discontinued operations:
Income from discontinued operations	1,239	1,013
Net (loss) income	$ (17,411)	$ 8,027
Net (loss) income per share:
Basic	$ (1.42)	$ 1.57
Diluted	$ (1.42)	$ 1.57
Shares used in calculation:
Basic	12,234,661	5,100,310
Diluted	12,234,661	5,102,914