STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenue:
Total revenue	$ 2,361	$ 668
Operating expenses:
Research and development	30,911	15,455
General and administrative	11,186	4,857
Total operating expenses	42,097	20,312
Loss from operations	(39,736)	(19,644)
Other income (expense):
Interest income	1,582	387
Interest expense	(1,076)	(3,924)
Foreign exchange loss	(17)	0
Change in fair value of warrant liability	0	11
Change in fair value of derivative liability	0	(676)
Total other income (expense)	489	(4,202)
Net loss	$ (39,247)	$ (23,846)
Net loss per common share, basic and diluted (in usd per share)	$ (1.43)	$ (4.49)
Weighted average common shares outstanding, basic and diluted (in shares)	27,493,558	5,305,062
Grant revenue
Revenue:
Total revenue	$ 1,786	$ 668
Revenue under collaborative agreement
Revenue:
Total revenue	$ 575	$ 0