Consolidated Statements of Operations (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Income Statement [Abstract]
License and other revenue (includes $442 and $81 from a related party for the three months ended June 30, 2025 and 2024, respectively, and $448 and $156 for the six months ended June 30, 2025 and 2024, respectively.)	$ 492	$ 90	$ 2,822	$ 320
Type of Revenue [Extensible List]	us-gaap:LicenseMember	us-gaap:LicenseMember	us-gaap:LicenseMember	us-gaap:LicenseMember
Operating expenses:
Cost of goods sold	$ 0	$ 0	$ 248	$ 0
Research and development (includes $243 and $503 to a related party for the three and six months ended June 30, 2024, respectively)	1,584	4,603	6,047	10,218
General and administrative	2,476	3,077	5,300	5,901
Total operating expenses	4,060	7,680	11,595	16,119
Loss from operations	(3,568)	(7,590)	(8,773)	(15,799)
Interest income	115	419	278	767
Other income, net	1,720	1,917	1,927	418
Non-cash interest expense on liability related to the sales of future royalties	(2,762)	(2,340)	(5,435)	(4,743)
Loss before income taxes	(4,495)	(7,594)	(12,003)	(19,357)
Income tax expense	0	0	715	0
Net loss	$ (4,495)	$ (7,594)	$ (12,718)	$ (19,357)
Net loss per share of common stock - basic	$ (0.06)	$ (0.1)	$ (0.16)	$ (0.27)
Net loss per share of common stock - diluted	$ (0.06)	$ (0.1)	$ (0.16)	$ (0.27)
Weighted average shares outstanding - basic	77,844,055	74,731,139	77,385,497	72,292,183
Weighted average shares outstanding - diluted	77,844,055	74,731,139	77,385,497	72,292,183
Net Income (Loss)	$ (4,495)	$ (7,594)	$ (12,718)	$ (19,357)
Unrealized loss on available-for-sale investments	0	(1)	0	(1)
Comprehensive loss	$ (4,495)	$ (7,595)	$ (12,718)	$ (19,358)