CONDENSED STATEMENTS OF OPERATIONS (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue:
Total revenue	$ 241	$ 411	$ 1,597	$ 411
Operating expenses:
Research and development	9,028	4,354	22,530	9,779
General and administrative	2,803	1,056	7,523	2,616
Total operating expenses	11,831	5,410	30,053	12,395
Loss from operations	(11,590)	(4,999)	(28,456)	(11,984)
Other income (expense):
Interest income	451	60	1,259	132
Interest expense	(266)	(890)	(711)	(3,741)
Foreign exchange gain (loss)	14		(8)
Change in fair value of warrant liability		(1,713)		(2,709)
Change in fair value of derivative liability		(359)		(676)
Total other income (expense)	199	(2,902)	540	(6,994)
Net loss	$ (11,391)	$ (7,901)	$ (27,916)	$ (18,978)
Net loss per common share, basic and diluted	$ (0.40)	$ (10.45)	$ (1.03)	$ (25.33)
Weighted average common shares outstanding, basic and diluted	28,719,932	755,908	27,065,774	749,198
Grant Revenue
Revenue:
Total revenue	$ 241	$ 411	$ 1,097	$ 411
Collaborative Agreement
Revenue:
Total revenue			$ 500