Unaudited Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Income Statement [Abstract]
Revenue	$ 0	$ 0	$ 0	$ 8
Operating expenses:
Research and development	(14)	2,197	8	9,877
General and administrative	800	1,179	1,636	4,063
Restructuring and other charges	(9)	(3,795)	31	24,494
Total operating expenses	777	(419)	1,675	38,434
Income (loss) from operations	(777)	419	(1,675)	(38,426)
Other income (expense):
Interest and investment income	181	394	369	947
Change in fair value of purchase warrant liability	67	2,270	1,094	14,958
Other expense	0	0	0	(2)
Total other income, net	248	2,664	1,463	15,903
Income (loss) before income taxes	(529)	3,083	(212)	(22,523)
Income tax expense	0	(5)	0	(5)
Net income (loss)	$ (529)	$ 3,078	$ (212)	$ (22,528)
Net income (loss per share) - basic	$ (0.04)	$ 0.25	$ (0.02)	$ (1.85)
Net income (loss per share) - diluted	$ (0.04)	$ 0.25	$ (0.02)	$ (1.85)
Weighted-average common shares - basic	12,319,147	12,203,956	12,301,476	12,168,081
Weighted-average common shares - diluted	12,319,147	12,399,068	12,301,476	12,168,081
Comprehensive income (loss):
Net income (loss)	$ (529)	$ 3,078	$ (212)	$ (22,528)
Net unrealized loss on marketable securities	0	0	0	(6)
Comprehensive income (loss)	$ (529)	$ 3,078	$ (212)	$ (22,534)