Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
License-related revenue	$ 0	$ 0	$ 0	$ 30,000
Operating expenses:
Research and development	13,831	18,198	27,608	34,822
General and administrative	8,576	6,426	14,460	12,967
Restructuring charges	3,234	0	3,234	0
Total operating expenses	25,641	24,624	45,302	47,789
Loss from operations	(25,641)	(24,624)	(45,302)	(17,789)
Interest expense	(3,108)	(733)	(4,040)	(1,415)
Other income (expense), net	557	144	1,409	190
Net loss	$ (28,192)	$ (25,213)	$ (47,933)	$ (19,014)
Net loss per share — basic (in dollars per share)	$ (0.46)	$ (0.46)	$ (0.79)	$ (0.37)
Net loss per share — diluted (in dollars per share)	$ (0.46)	$ (0.46)	$ (0.79)	$ (0.37)
Weighted average common shares outstanding— basic (in shares)	60,717,899	54,654,822	60,673,195	51,647,148
Weighted average common shares outstanding— diluted (in shares)	60,717,899	54,654,822	60,673,195	51,647,148
Comprehensive loss:
Net loss	$ (28,192)	$ (25,213)	$ (47,933)	$ (19,014)
Other comprehensive loss:
Unrealized gain (loss) on marketable securities, net of tax of $0	348	(259)	794	(949)
Comprehensive loss	$ (27,844)	$ (25,472)	$ (47,139)	$ (19,963)