Condensed Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Collaboration revenue	$ 5,851	$ 8,756	$ 17,210	$ 16,003
Operating expenses
Research and development	22,796	14,979	42,451	26,546
General and administrative	5,554	4,828	11,478	9,643
Total operating expenses	28,350	19,807	53,929	36,189
Loss from operations	(22,499)	(11,051)	(36,719)	(20,186)
Interest income and other income , net	443	104	650	218
Net loss	(22,056)	(10,947)	(36,069)	(19,968)
Unrealized losses on marketable securities	(825)	(3)	(2,917)	(11)
Comprehensive loss	$ (22,881)	$ (10,950)	$ (38,986)	$ (19,979)
Net loss per common share, basic	$ (0.57)	$ (0.33)	$ (0.93)	$ (0.62)
Net loss per common share, diluted	$ (0.57)	$ (0.33)	$ (0.93)	$ (0.62)
Weighted average number of common shares outstanding used in computing net loss per share, basic	38,660,971	32,854,926	38,626,659	32,321,481
Weighted average number of common shares outstanding used in computing net loss per share, diluted	38,660,971	32,854,926	38,626,659	32,321,481