Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Operating expenses:
Research and development	$ 15,847	$ 27,626	$ 49,828	$ 77,165
General and administrative	6,277	7,738	21,148	23,627
Total operating expenses	22,124	35,364	70,976	100,792
Loss from operations	(22,124)	(35,364)	(70,976)	(100,792)
Other income (expense):
Interest income	562	776	1,354	2,876
Other (expense) income	(92)	(489)	(469)	(1,813)
Total other income (expense), net	470	287	885	1,063
Net loss	$ (21,654)	$ (35,077)	$ (70,091)	$ (99,729)
Net loss per share, basic (in dollars per share)	$ (0.60)	$ (0.97)	$ (1.93)	$ (2.76)
Net loss per share, diluted (in dollars per share)	$ (0.60)	$ (0.97)	$ (1.93)	$ (2.76)
Weighted average common shares outstanding, basic (in shares)	36,346,181	36,219,137	36,304,050	36,175,249
Weighted average common shares outstanding, diluted (in shares)	36,346,181	36,219,137	36,304,050	36,175,249
Comprehensive loss:
Net loss	$ (21,654)	$ (35,077)	$ (70,091)	$ (99,729)
Other comprehensive income:
Change in unrealized loss on investments	(202)	(68)	(2,074)	(471)
Comprehensive loss	$ (21,856)	$ (35,145)	$ (72,165)	$ (100,200)