Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Collaboration revenue	$ 2,592	$ 4,789
Operating expenses:
Research and development	17,831	16,334
General and administrative	10,759	5,498
Total operating expenses	28,590	21,832
Loss from operations	(25,998)	(17,043)
Other income, net	70	44
Net loss	$ (25,928)	$ (16,999)
Net loss per share, basic and diluted	$ (0.64)	$ (0.54)
Weighted-average common shares outstanding, basic and diluted	40,644	31,510
Comprehensive loss:
Net loss	$ (25,928)	$ (16,999)
Other comprehensive (loss) gain:
Unrealized (loss) gain on marketable securities	(693)	(2)
Total other comprehensive loss	(693)	(2)
Comprehensive loss	$ (26,621)	$ (17,001)