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	$ 31,379	$ 25,677	$ 60,446	$ 46,070
General and administrative	13,245	11,978	27,371	22,448
Total operating expenses	44,624	37,655	87,817	68,518
Loss from operations	(44,624)	(37,655)	(87,817)	(68,518)
Total other income (loss), net:
Interest income	162	475	310	980
Other (loss) income, net	(27)	(408)	(845)	(973)
Loss before income taxes	(44,489)	(37,588)	(88,352)	(68,511)
Income tax expense	150		150
Net loss	$ (44,639)	$ (37,588)	$ (88,502)	$ (68,511)
Net loss per share - basic	$ (0.69)	$ (0.60)	$ (1.38)	$ (1.10)
Net loss per share - diluted	$ (0.69)	$ (0.60)	$ (1.38)	$ (1.10)
Weighted-average common shares outstanding - basic	64,467,483	62,344,718	64,231,579	62,399,034
Weighted-average common shares outstanding - diluted	64,467,483	62,344,718	64,231,579	62,399,034
Comprehensive loss:
Net loss	$ (44,639)	$ (37,588)	$ (88,502)	$ (68,511)
Other comprehensive income (loss), net of tax:
Unrealized (loss) gain on available-for-sale securities	(94)	(16)	(289)	26
Foreign currency translation adjustment		(22)		61
Total other comprehensive (loss) income	(94)	(38)	(289)	87
Comprehensive loss	$ (44,733)	$ (37,626)	$ (88,791)	$ (68,424)