Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Operating expenses
Research and development	$ 37,635	$ 36,270
General and administrative	13,531	12,058
Total operating expenses	51,166	48,328
Loss from operations	(51,166)	(48,328)
Interest income	157	1,115
Interest expense	(163)	(350)
Net loss	(51,172)	(47,563)
Unrealized (loss) gain on marketable securities	(71)	12
Comprehensive loss	$ (51,243)	$ (47,551)
Net loss per share attributable to common stockholders, basic and diluted	$ (1.75)	$ (2.73)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted	29,174,386	17,405,688