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
Income Statement [Abstract]
Revenues	$ 104	$ 463	$ 211	$ 630
Operating expenses:
Research and development	5,904	13,401	12,462	25,074
Selling, general and administrative	8,410	22,715	21,867	42,673
Total operating expenses	14,314	36,116	34,329	67,747
Loss from operations	(14,210)	(35,653)	(34,118)	(67,117)
Interest expense, net	(2,772)	(3,502)	(5,532)	(7,022)
Gain (loss) on warrant liability	4,413	(5,146)	13,402	(2,496)
Other income, net	5,735	2,901	4,924	17,774
Loss before income taxes	(6,834)	(41,400)	(21,324)	(58,861)
Income tax benefit	(837)	0	(837)	0
Loss from continuing operations	(5,997)	(41,400)	(20,487)	(58,861)
Gain (loss) from discontinued operations	484	(37,131)	1,166	(51,934)
Net loss	$ (5,513)	$ (78,531)	$ (19,321)	$ (110,795)
Net loss per share from continuing operations, basic and diluted	$ (0.03)	$ (0.65)	$ (0.11)	$ (0.97)
Net (loss) gain per share from discontinued operations, basic and diluted	0	(0.58)	0.01	(0.85)
Net loss per share, basic and diluted	$ (0.03)	$ (1.23)	$ (0.10)	$ (1.82)
Weighted average shares outstanding, basic and diluted	184,371,626	63,942,298	183,789,876	60,770,246