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
Income Statement [Abstract]
Collaboration revenue	$ 1,183	$ 4,935	$ 5,657	$ 14,105
Operating expenses:
Research and development	15,366	17,077	58,216	50,789
General and administrative	9,707	8,628	31,564	20,811
Restructuring expenses	465	0	465	0
Total operating expenses	25,538	25,705	90,245	71,600
Loss from operations	(24,355)	(20,770)	(84,588)	(57,495)
Other income, net	617	54	852	132
Net loss	$ (23,738)	$ (20,716)	$ (83,736)	$ (57,363)
Net loss per share, basic	$ (0.51)	$ (0.57)	$ (1.97)	$ (1.71)
Net loss per share, diluted	$ (0.51)	$ (0.57)	$ (1.97)	$ (1.71)
Weighted-average common shares outstanding, basic	46,213	36,606	42,603	33,603
Weighted-average common shares outstanding, diluted	46,213	36,606	42,603	33,603
Comprehensive loss:
Net loss	$ (23,738)	$ (20,716)	$ (83,736)	$ (57,363)
Other comprehensive (loss) gain:
Unrealized gain (loss) on marketable securities	147	(78)	(524)	(85)
Total other comprehensive loss	147	(78)	(524)	(85)
Comprehensive loss	$ (23,591)	$ (20,794)	$ (84,260)	$ (57,448)