Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Revenues:
Royalty revenue	$ 726	$ 7	$ 1,379	$ 1,225
Total revenues	726	7	1,379	1,225
Operating expenses:
Research and development	4,153	5,046	16,030	15,439
General and administrative	4,213	3,893	11,674	12,396
Total operating expenses	8,366	8,939	27,704	27,835
Loss from operations	(7,640)	(8,932)	(26,325)	(26,610)
Other income and expense:
Other income, net	5	186	17	429
Interest income	168	446	849	1,575
Other income, net	173	632	866	2,004
Net loss before taxes	(7,467)	(8,300)	(25,459)	(24,606)
Income tax benefit	0	0	0	29
Net loss	$ (7,467)	$ (8,300)	$ (25,459)	$ (24,577)
Net loss per share:
Basic (in dollars per share)	$ (0.90)	$ (1.04)	$ (3.11)	$ (3.01)
Diluted (in dollars per share)	$ (0.90)	$ (1.04)	$ (3.11)	$ (3.01)
Weighted average number of common shares outstanding:
Basic (in shares)	8,327,488	7,978,457	8,179,341	8,161,904
Diluted (in shares)	8,327,488	7,978,457	8,179,341	8,161,904
Other comprehensive income:
Unrealized gain on short-term investments	$ 0	$ 7	$ 0	$ 5
Total comprehensive loss	$ (7,467)	$ (8,293)	$ (25,459)	$ (24,572)