Condensed Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Expenses
Research and development	$ 19,953	$ 19,036	$ 37,017	$ 37,424
General and administrative	8,077	8,031	16,683	15,852
Total expenses	28,030	27,067	53,700	53,276
Interest and other income (expense)
Other income		349	750	693
Interest income	153	56	197	147
Interest expense		(1)		(2)
Loss on disposal of property and equipment		(11)		(11)
Loss before income tax expense	(27,877)	(26,674)	(52,753)	(52,449)
Income tax expense		(1)		(1)
Net loss	$ (27,877)	$ (26,675)	$ (52,753)	$ (52,450)
Net loss per share, basic	$ (0.72)	$ (0.72)	$ (1.38)	$ (1.42)
Net loss per share, diluted	$ (0.72)	$ (0.72)	$ (1.38)	$ (1.42)
Weighted-average shares used in computing net loss per share, basic	38,591,436	36,893,827	38,288,831	36,867,592
Weighted-average shares used in computing net loss per share, diluted	38,591,436	36,893,827	38,288,831	36,867,592