CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) [Abstract]
Revenue	$ 34	$ 15	$ 39	$ 20
Operating expense:
Licensing costs	0	0	(4)	(9,438)
Research and development	1,255	1,149	2,482	2,301
Selling, general and administrative	3,046	3,008	6,231	44,951
Total operating expense	4,301	4,157	8,709	37,814
Income (loss) from operations	(4,267)	(4,142)	(8,670)	(37,794)
Interest and other income, net	203	10	229	26
Income (loss) before taxes	(4,064)	(4,132)	(8,441)	(37,768)
Income tax (expense) benefit	(373)	(2,719)	684	4,474
Net income (loss)	$ (4,437)	$ (6,851)	$ (7,757)	$ (33,294)
Basic income (loss) per share (in dollars per share)	$ (0.06)	$ (0.10)	$ (0.11)	$ (0.47)
Diluted income (loss) per share (in dollars per share)	$ (0.06)	$ (0.10)	$ (0.11)	$ (0.47)
Weighted average shares outstanding - basic (in shares)	71,255	71,111	71,244	71,085
Weighted average shares outstanding - diluted (in shares)	71,255	71,111	71,244	71,085