Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Operating expense
Research and development	$ 4,308	$ 1,444	$ 18,420	$ 5,137
General and administrative	2,465	1,876	4,965	3,692
Total operating expense	6,773	3,320	23,385	8,829
Loss from operations	(6,773)	(3,320)	(23,385)	(8,829)
Other income (expense)
Interest income	29	7	48	34
Interest expense	(583)	(3)	(1,573)	(7)
Net loss on extinguishment of debt	(2,387)		(2,387)
Gain on forgiveness of debt	149		149
Change in fair value of warrant liabilities	707	(413)	(826)	241
Total other income (expense)	(2,085)	(409)	(4,589)	268
Net loss and comprehensive loss	$ (8,858)	$ (3,729)	$ (27,974)	$ (8,561)
Net loss per share basic and diluted	$ (0.10)	$ (0.08)	$ (0.36)	$ (0.22)
Weighted-average common shares outstanding     basic and diluted	87,995,447	44,157,059	78,576,716	39,136,126