Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating expenses:
Research and development	$ 6,763,848	$ 9,096,122
General and administrative	3,425,833	2,776,468
Total operating expenses	10,189,681	11,872,590
Other income (expense):
Interest (expense) income	(1,057)	224,442
Foreign currency gain	521,983	2,247,891
Total other (expense) income	520,926	2,472,333
Net loss	(9,668,755)	(9,400,257)
Other comprehensive loss:
Foreign currency translation	(402,850)	(2,424,653)
Total comprehensive loss	$ (10,071,605)	$ (11,824,910)
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share)	$ (0.46)	$ (0.45)
Weighted-average common shares outstanding, basic and diluted (in shares)	21,186,827	21,052,726