Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Operating expenses:
Research and development	$ 9,326	$ 8,074	$ 19,567	$ 14,887
General and administrative	7,617	37,146	15,881	44,182
Total operating expenses	16,943	45,220	35,448	59,069
Loss from operations	(16,943)	(45,220)	(35,448)	(59,069)
Other income (expense):
Interest income/(expense), net	82	(69)	83	(156)
Foreign exchange gain/(loss), net	(89)	(35)	(44)	134
Other income/(expense)	(7)	72	1	80
Total other income (expense), net	(14)	(32)	40	58
Loss before income taxes	(16,957)	(45,252)	(35,408)	(59,011)
Income taxes	0	0	0	0
Net loss	(16,957)	(45,252)	(35,408)	(59,011)
Other comprehensive gain/(loss):
(Loss)/gain on foreign currency translation	(147)	704	(196)	763
Comprehensive loss	$ (17,104)	$ (44,548)	$ (35,604)	$ (58,248)
Net loss per common share, basic	$ (0.04)	$ (0.11)	$ (0.08)	$ (0.15)
Net loss per common share, diluted	$ (0.04)	$ (0.11)	$ (0.08)	$ (0.15)
Weighted-average common shares, basic	423,630,395	410,823,106	422,951,839	400,322,562
Weighted-average common shares, diluted	423,630,395	410,823,106	422,951,839	400,322,562