Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Operating expenses:
Research and development	$ 10,694,029	$ 4,319,826	$ 19,790,151	$ 7,998,270
General and administrative	3,786,886	1,618,589	6,563,354	2,347,915
Total operating expenses	14,480,915	5,938,415	26,353,505	10,346,185
Other income (expense):
Interest income (expense)	2,678	(4,091)	227,120	(7,439)
Foreign currency (loss) gain	(1,889,690)	680,058	358,201	1,615,974
Total other income (expense)	(1,887,012)	675,967	585,321	1,608,535
Net loss	(16,367,927)	(5,262,448)	(25,768,184)	(8,737,650)
Other comprehensive income (loss):
Foreign currency translation	1,756,783	44,508	(667,870)	(1,986,667)
Total comprehensive loss	$ (14,611,144)	$ (5,217,940)	$ (26,436,054)	$ (10,724,317)
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (0.78)	$ (4.45)	$ (1.22)	$ (7.43)
Weighted-average common shares outstanding, basic and diluted (in shares)	21,107,056	1,181,583	21,079,891	1,176,417