CONDENSED STATEMENTS OF OPERATIONS (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue:
Total revenue	$ 703		$ 1,356
Operating expenses:
Research and development	7,781	$ 3,190	13,502	$ 5,425
General and administrative	2,404	917	4,720	1,560
Total operating expenses	10,185	4,107	18,222	6,985
Loss from operations	(9,482)	(4,107)	(16,866)	(6,985)
Other income (expense):
Interest income	491	36	808	72
Interest expense	(219)	(1,447)	(445)	(2,851)
Foreign exchange loss	(22)		(22)
Change in fair value of warrant liability		(1,001)		(996)
Change in fair value of derivative liability		(155)		(317)
Total other income (expense)	250	(2,567)	341	(4,092)
Net loss	$ (9,232)	$ (6,674)	$ (16,525)	$ (11,077)
Net loss per common share, basic and diluted	$ (0.33)	$ (8.95)	$ (0.63)	$ (14.85)
Weighted average common shares outstanding, basic and diluted	27,932,610	745,812	26,224,986	745,812
Grant Revenue
Revenue:
Total revenue	$ 203		$ 856
Collaborative Agreement
Revenue:
Total revenue	$ 500		$ 500