CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenue:
Total revenue	$ 522	$ 1,157	$ 26,371	$ 15,238
Operating expenses:
Research and development	10,847	15,467	37,893	47,436
General and administrative	6,563	7,186	20,634	20,711
Impairment of prepaid manufacturing services	4,508		4,508
Total operating expenses	21,918	22,653	63,035	68,147
Loss from operations	(21,396)	(21,496)	(36,664)	(52,909)
Other income (expense):
Interest expense	(758)	(689)	(2,007)	(2,091)
Interest income	119	4	157	18
Other income	35	479	1,711	1,163
Change in fair value of derivative liability - warrants	2,722		2,722
Total other income (expense), net	2,118	(206)	2,583	(910)
Net loss	$ (19,278)	$ (21,702)	$ (34,081)	$ (53,819)
Net loss per share attributable to common stockholders, basic	$ (0.77)	$ (0.97)	$ (1.46)	$ (2.49)
Net loss per share attributable to common stockholders, diluted	$ (0.77)	$ (0.97)	$ (1.46)	$ (2.49)
Weighted average common shares outstanding, basic	25,159,757	22,325,334	23,373,684	21,599,405
Weighted average common shares outstanding, diluted	25,159,757	22,325,334	23,373,684	21,599,405
Collaboration
Revenue:
Revenue	$ 28	$ 1,157	$ 25,877	$ 15,238
Grant
Revenue:
Revenue	$ 494		$ 494