CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income Statement [Abstract]
Revenues	$ 198	$ 135	$ 296	$ 234
Operating expenses:
Research and development	7,306	7,233	11,014	9,967
General and administrative	3,288	3,220	7,058	6,460
Total operating expenses	10,594	10,453	18,072	16,427
Operating loss	(10,396)	(10,318)	(17,776)	(16,193)
Other income, net	1,001	280	2,140	543
Loss from continuing operations before income taxes	(9,395)	(10,038)	(15,636)	(15,650)
Income tax expense	0	0	0	0
Loss from continuing operations	(9,395)	(10,038)	(15,636)	(15,650)
Loss from discontinued operations, net of income taxes	(11)	(20)	(19)	(30)
Net loss	$ (9,406)	$ (10,058)	$ (15,655)	$ (15,680)
Loss per share from continuing operations, basic (in dollars per share)	$ (0.22)	$ (3.08)	$ (0.37)	$ (4.81)
Loss per share from continuing operations, diluted (in dollars per share)	(0.22)	(3.08)	(0.37)	(4.81)
Loss per share from discontinued operations, basic (in dollars per share)	0.00	(0.01)	0.00	(0.01)
Loss per share from discontinued operations, diluted (in dollars per share)	0.00	(0.01)	0.00	(0.01)
Loss per share, basic (in dollars per share)	(0.22)	(3.09)	(0.37)	(4.82)
Loss per share, diluted (in dollars per share)	$ (0.22)	$ (3.09)	$ (0.37)	$ (4.82)
Weighted average shares outstanding - basic (in shares)	42,586	3,274	42,584	3,265
Weighted average shares outstanding - diluted (in shares)	42,586	3,274	42,584	3,265
Other comprehensive gain (loss):
Unrealized gain (loss) on marketable securities, net of tax of $0	$ 12	$ 0	$ (84)	$ 0
Total other comprehensive gain (loss)	12	0	(84)	0
Comprehensive loss	$ (9,394)	$ (10,058)	$ (15,739)	$ (15,680)