CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Revenue	$ 2	$ 3	$ 5	$ 7
Operating expense:
Research and development	1,176	1,218	3,667	7,341
Selling, general and administrative	3,213	4,420	10,066	16,333
Total operating expense	4,389	5,638	13,733	23,674
(Loss) from operations	(4,387)	(5,635)	(13,728)	(23,667)
Interest and other income, net	548	716	1,771	2,824
(Loss) before taxes	(3,839)	(4,919)	(11,957)	(20,843)
Income tax (expense) benefit	0	1	(3)	79
Net (loss)	$ (3,839)	$ (4,918)	$ (11,960)	$ (20,764)
Basic (loss) per share (in dollars per share)	$ (1.07)	$ (1.36)	$ (3.32)	$ (5.79)
Diluted (loss) per share (in dollars per share)	$ (1.07)	$ (1.36)	$ (3.32)	$ (5.79)
Weighted average shares outstanding basic (in shares)	3,603	3,612	3,600	3,586
Weighted average shares outstanding diluted (in shares)	3,603	3,612	3,600	3,586