CONDENSED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue:
Revenue	$ 0	$ 703	$ 320	$ 1,356
Operating expenses:
Research and development	20,856	7,781	32,305	13,502
General and administrative	3,242	2,404	6,401	4,720
Total operating expenses	24,098	10,185	38,706	18,222
Loss from operations	(24,098)	(9,482)	(38,386)	(16,866)
Other income (expense):
Loss from remeasurement of development derivative liability	(3,708)	0	(4,162)	0
Interest income	21	491	232	808
Interest expense	(379)	(219)	(757)	(445)
Foreign exchange gain (loss)	22	(22)	26	(22)
Total other income (expense)	(4,044)	250	(4,661)	341
Net loss	$ (28,142)	$ (9,232)	$ (43,047)	$ (16,525)
Net loss per common share, basic and diluted (in usd per share)	$ (0.98)	$ (0.33)	$ (1.50)	$ (0.63)
Weighted average common shares outstanding, basic and diluted	28,805,238	27,932,610	28,789,256	26,224,986
Grant Revenue
Revenue:
Revenue	$ 0	$ 203	$ 320	$ 856
Collaborative Agreement
Revenue:
Revenue	$ 0	$ 500	$ 0	$ 500