Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Revenue	$ 4,746		$ 11,847
Operating expenses:
Research and development	11,791	$ 16,774	44,096	$ 78,462
General and administrative	8,589	8,683	23,328	30,019
Impairment of long-lived assets	616		616
Total operating expenses	20,996	25,457	68,040	108,481
Loss from operations	(16,250)	(25,457)	(56,193)	(108,481)
Other income (expense):
Change in fair value of warrant liability	(100,456)		(100,456)
Interest income	1,109	9	1,651	50
Interest expense	(1,471)	(1,078)	(4,285)	(2,493)
Other expense	(19)	(1)	(24)	(12)
Total other income (expense), net	(100,837)	(1,070)	(103,114)	(2,455)
Net loss	$ (117,087)	$ (26,527)	$ (159,307)	$ (110,936)
Net loss per common share, basic	$ (0.93)	$ (0.65)	$ (1.88)	$ (2.79)
Net loss per common share, diluted	$ (0.93)	$ (0.65)	$ (1.88)	$ (2.79)
Weighted average common shares outstanding, basic	125,700,799	40,937,808	84,630,796	39,761,764
Weighted average common shares outstanding, diluted	125,700,799	40,937,808	84,630,796	39,761,764