Condensed Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Expenses
Research and development	$ 16,045	$ 18,721	$ 53,062	$ 56,145
General and administrative	7,247	8,796	23,930	24,648
Total expenses	23,292	27,517	76,992	80,793
Interest and other income (expense)
Other income		158	750	851
Interest income	233	36	430	183
Interest expense		(1)		(3)
Loss on disposal of property and equipment		(34)		(45)
Loss before income tax expense	(23,059)	(27,358)	(75,812)	(79,807)
Income tax expense				(1)
Net loss	$ (23,059)	$ (27,358)	$ (75,812)	$ (79,808)
Net loss per share, basic	$ (0.60)	$ (0.74)	$ (1.97)	$ (2.16)
Net loss per share, diluted	$ (0.60)	$ (0.74)	$ (1.97)	$ (2.16)
Weighted-average shares used in computing net loss per share, basic	38,720,575	36,918,255	38,434,327	36,884,665
Weighted-average shares used in computing net loss per share, diluted	38,720,575	36,918,255	38,434,327	36,884,665