Condensed Consolidated Statements of Operations and Comprehensive Loss - 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	$ 18,877	$ 22,544	$ 38,130	$ 41,024
General and administrative	8,897	8,831	19,062	17,235
Total operating expenses	27,774	31,375	57,192	58,259
Loss from operations	(27,774)	(31,375)	(57,192)	(58,259)
Other (expense) income:
Interest (expense) income, net	(285)	9	(655)	19
Other expense, net	5	(21)	(40)	(46)
Total other (expense), net	(280)	(12)	(695)	(27)
Net loss	(28,054)	(31,387)	(57,887)	(58,286)
Comprehensive loss	$ (28,054)	$ (31,387)	$ (57,887)	$ (58,286)
Net loss per share - basic	$ (0.64)	$ (0.74)	$ (1.32)	$ (1.39)
Net loss per share - diluted	$ (0.64)	$ (0.74)	$ (1.32)	$ (1.39)
Weighted-average number of common shares outstanding - basic	43,696	42,510	43,696	42,067
Weighted-average number of common shares outstanding - diluted	43,696	42,510	43,696	42,067