CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating expenses:
Research and development	$ 5,204	$ 7,455
General and administrative	5,804	5,032
Total operating expenses	11,008	12,487
Loss from operations	(11,008)	(12,487)
Other income (expense):
Interest income	969	310
Interest expense	(42)	(243)
Loss on asset disposal	(105)
Other income, net	9	15
Net loss	$ (10,177)	$ (12,405)
Net loss per common share, basic	$ (0.33)	$ (0.40)
Net loss per common share, diluted	$ (0.33)	$ (0.40)
Weighted-average number of shares used in computing net loss per common share, basic	30,866,087	30,647,679
Weighted-average number of shares used in computing net loss per common share, diluted	30,866,087	30,647,679
Comprehensive loss:
Net loss	$ (10,177)	$ (12,405)
Other comprehensive items:
Unrealized gain (loss) on marketable securities	181	(566)
Total other comprehensive income (loss)	181	(566)
Total comprehensive loss	$ (9,996)	$ (12,971)