Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Income Statement And Statement Of Comprehensive Income [Abstract]
Revenue	$ 1,809	$ 860
Operating expenses:
Research and development	85,352	53,274
General and administrative	23,611	19,232
Impairment of intangible assets	0	859
Total operating expenses	108,963	73,365
Other operating income	20,968	19,312
Operating loss	(86,186)	(53,193)
Other (expense) income, net	(2,416)	283
Loss before income tax	(88,602)	(52,910)
Income tax benefit	0	213
Net loss	$ (88,602)	$ (52,697)
Net loss per share:
Basic (in dollars per share)	$ (0.96)	$ (0.76)
Diluted (in dollars per share)	$ (0.96)	$ (0.76)
Weighted average common shares outstanding:
Basic (in shares)	92,239,306	69,524,148
Diluted (in shares)	92,239,306	69,524,148
Other comprehensive (loss) income:
Foreign currency translation adjustments	$ 1,597	$ 970
Comprehensive loss	$ (87,005)	$ (51,727)