Condensed Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Collaboration revenue	$ 11,359	$ 7,247
Operating expenses
Research and development	19,656	11,566
General and administrative	5,923	4,816
Total operating expenses	25,579	16,382
Loss from operations	(14,220)	(9,135)
Interest income and other income , net	207	114
Net loss	(14,013)	(9,021)
Unrealized losses on marketable securities	(2,092)	(7)
Comprehensive loss	$ (16,105)	$ (9,028)
Net loss per common share, basic and diluted	$ (0.36)	$ (0.28)
Weighted average number of common shares outstanding used in computing net loss per share, basic and diluted	38,591,966	31,761,207