CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Operating expenses:
Research and development	$ 13,821	$ 13,193	$ 27,934	$ 25,297
Selling, general and administrative	6,749	5,804	14,413	11,636
Gain (Loss) on Disposition of Assets	0	0	(509)	0
Total operating expenses	20,570	18,997	41,838	36,933
Loss from operations	(20,570)	(18,997)	(41,838)	(36,933)
Other income (expense):
Interest income	4	3	7	5
Interest expense	(918)	(905)	(1,831)	(1,797)
Change in fair value of derivative liability	335	57	511	26
Other (expense) income, net	(59)	210	1	397
Total other expense, net	(638)	(635)	(1,312)	(1,369)
Loss before provision for income taxes	(21,208)	(19,632)	(43,150)	(38,302)
Provision for income taxes	4	6	27	12
Net loss and comprehensive loss	(21,212)	(19,638)	(43,177)	(38,314)
Deemed dividend on Class B Warrant price reset	0	0	(2,259)	(8,239)
Net loss attributable to common stockholders	$ (21,212)	$ (19,638)	$ (45,436)	$ (46,553)
Net loss per share attributable to common stockholders—basic and diluted	$ (0.60)	$ (0.74)	$ (1.31)	$ (1.97)
Weighted average common shares outstanding—basic and diluted (in shares)	35,437,000	26,527,000	34,592,000	23,655,000