CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Statement [Abstract]
Revenues	$ 99	$ 178
Operating expenses:
Research and development	2,734	4,452
Selling, general and administrative	3,240	4,417
Total operating expenses	5,974	8,869
Operating loss	(5,875)	(8,691)
Other income (expense), net	263	(3)
Loss from continuing operations before income taxes	(5,612)	(8,694)
Income tax expense	0	0
Loss from continuing operations	(5,612)	(8,694)
(Loss) income from discontinued operations, net of income taxes	(10)	13,364
Net (loss) income	$ (5,622)	$ 4,670
Loss per share from continuing operations, basic (in dollars per share)	$ (1.74)	$ (2.83)
Loss per share from continuing operations, diluted (in dollars per share)	(1.74)	(2.83)
Income (loss) per share from discontinued operations, diluted (in dollars per share)	0	4.34
Income (loss) per share from discontinued operations, basic (in dollars per share)	0	4.34
Income (loss) per share, diluted (in dollars per share)	(1.74)	1.51
Income (loss) per share, basic (in dollars per share)	$ (1.74)	$ 1.51
Weighted average shares outstanding - basic (in shares)	3,255	3,077
Weighted average shares outstanding - diluted (in shares)	3,255	3,077