Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Income Statement [Abstract]
Revenues	$ 15,451	$ 2,502
Operating expenses:
Research and development	56,778	91,169
General and administrative	30,047	37,360
Impairment of long-lived assets	1,065	36,420
Total operating expenses	87,890	164,949
Loss from operations	(72,439)	(162,447)
Other income (expense):
Change in fair value of warrant liability	(34,718)
Loss on debt extinguishment	(1,398)
Change in fair value of term loan	(1,538)
Interest income	3,572	249
Interest expense	(4,998)	(3,798)
Other expense	(47)	(18)
Total other expense, net	(39,127)	(3,567)
Net loss	$ (111,566)	$ (166,014)
Net loss per common share, basic	$ (0.96)	$ (3.78)
Net loss per common share, diluted	$ (0.96)	$ (3.78)
Weighted average common shares outstanding, basic	116,121,482	43,952,015
Weighted average common shares outstanding, diluted	116,121,482	43,952,015