CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Income Statement [Abstract]
Total revenues	$ 202	$ 98
Operating expenses:
Research and development	6,124	3,708
General and administrative	3,275	3,770
Total operating expenses	9,399	7,478
Operating loss	(9,197)	(7,380)
Other income, net	594	1,139
Loss from continuing operations before income taxes	(8,603)	(6,241)
Income tax expense	0	0
Loss from continuing operations	(8,603)	(6,241)
Loss from discontinued operations, net of income taxes	(8)	(8)
Net loss	$ (8,611)	$ (6,249)
Loss per share from continuing operations, basic (in dollars per share)	$ (0.20)	$ (0.15)
Loss per share from continuing operations, diluted (in dollars per share)	(0.20)	(0.15)
Loss per share from discontinued operations, basic (in dollars per share)	0	0
Loss per share from discontinued operations, diluted (in dollars per share)	0	0
Loss per share, basic (in dollars per share)	(0.20)	(0.15)
Loss per share, diluted (in dollars per share)	$ (0.20)	$ (0.15)
Weighted average shares outstanding - basic (in shares)	42,673	42,581
Weighted average shares outstanding - diluted (in shares)	42,673	42,581
Other comprehensive loss:
Unrealized losses on marketable securities, net of tax of $0	$ (20)	$ (96)
Total other comprehensive loss	(20)	(96)
Comprehensive loss	$ (8,631)	$ (6,345)