CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) [Abstract]
Revenue	$ 2	$ 34	$ 4	$ 39
Operating expense:
Licensing costs	0	0	0	(4)
Research and development	4,755	1,255	6,123	2,482
Selling, general and administrative	7,366	3,046	11,913	6,231
Total operating expense	12,121	4,301	18,036	8,709
(Loss) from operations	(12,119)	(4,267)	(18,032)	(8,670)
Interest and other income, net	740	203	2,108	229
(Loss) before taxes	(11,379)	(4,064)	(15,924)	(8,441)
Income tax (expense) benefit	0	(373)	78	684
Net (loss)	$ (11,379)	$ (4,437)	$ (15,846)	$ (7,757)
Basic (loss) per share (in dollars per share)	$ (0.16)	$ (0.06)	$ (0.22)	$ (0.11)
Diluted (loss) per share (in dollars per share)	$ (0.16)	$ (0.06)	$ (0.22)	$ (0.11)
Weighted average shares outstanding - basic (in shares)	71,466	71,255	71,445	71,244
Weighted average shares outstanding - diluted (in shares)	71,466	71,255	71,445	71,244