Condensed Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Operating expenses:
Research and development (including related party expenses of $747 and $98 for the three months ended June 30, 2021 and 2020, respectively, and $2,359 and $315 for the six months ended June 30, 2021 and 2020, respectively)	$ 17,651	$ 18,178	$ 34,909	$ 42,493
General and administrative	6,079	3,046	11,964	6,327
Total operating expenses	23,730	21,224	46,873	48,820
Loss from operations	(23,730)	(21,224)	(46,873)	(48,820)
Other income (expense), net:
Interest expense	(7)		(7)	(7)
Interest income	93	44	155	179
Grant income	378	1,036	378	1,365
Realized gain on marketable securities	1		1
Foreign currency transaction gains (losses)	(414)	(176)	1,447	(179)
Total other income (expense), net	51	904	1,974	1,358
Net loss	$ (23,679)	$ (20,320)	$ (44,899)	$ (47,462)
Net loss per share, basic and diluted	$ (0.46)	$ (1.72)	$ (0.87)	$ (5.99)
Weighted-average shares outstanding, basic and diluted	51,508,340	11,803,778	51,342,585	7,926,818