Condensed Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Operating expenses:
Research and development	$ 12,245	$ 17,749	$ 29,142	$ 29,988
General and administrative	7,553	6,762	15,354	13,408
Total operating expenses	19,798	24,511	44,496	43,396
Loss from operations	(19,798)	(24,511)	(44,496)	(43,396)
Interest income, net	369	15	436	33
Net loss	(19,429)	(24,496)	(44,060)	(43,363)
Unrealized loss on available-for-sale securities	(300)	0	(1,222)	0
Comprehensive loss	$ (19,729)	$ (24,496)	$ (45,282)	$ (43,363)
Net loss per share, basic and diluted	$ (0.55)	$ (0.70)	$ (1.25)	$ (1.25)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted	35,126,365	34,876,050	35,120,282	34,825,281