Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Operating expenses:
Research and development	$ 11,208	$ 6,680	$ 27,429	$ 14,154
General and administrative	3,225	1,518	9,379	2,875
Total operating expenses	14,433	8,198	36,808	17,029
Loss from operations	14,433	8,198	36,808	17,029
Other expenses, net	146	10,470	87	21,022
Net loss before tax	14,579	18,668	36,895	38,051
Income tax expense	24	57	23	86
Net loss	14,603	18,725	36,918	38,137
Other comprehensive (income) loss:
Unrealized gain on available-for-sale securities	(7)		(7)
Foreign currency translation adjustments	10		10
Total other comprehensive loss	3		3
Comprehensive loss	$ 14,606	$ 18,725	$ 36,921	$ 38,137
Net loss per share, basic and diluted	$ (0.86)	$ (30.63)	$ (2.49)	$ (62.39)
Weighted-average shares used to compute net loss per share, basic and diluted	16,884,244	611,226	14,809,131	611,226