Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating expenses
Research and development	$ 10,362	$ 13,235
General and administrative	3,130	3,704
Total operating expenses	13,492	16,939
Loss from operations	(13,492)	(16,939)
Other income (expense), net
Interest income, net	434	61
Foreign exchange transaction gain (loss), net	64	(60)
Total other income , net	498	1
Net loss	$ (12,994)	$ (16,938)
Net loss per common share, basic	$ (0.51)	$ (0.67)
Net loss per common share, diluted	$ (0.51)	$ (0.67)
Weighted-average number of shares used in computing net loss per common share, basic	25,672,902	25,261,832
Weighted-average number of shares used in computing net loss per common share, diluted	25,672,902	25,261,832
Other comprehensive loss, net of tax
Currency translation gain (loss)	$ 25	$ (170)
Unrealized gain (loss) on marketable securities	92	(205)
Other comprehensive gain (loss), net of tax	117	(375)
Total comprehensive loss	$ (12,877)	$ (17,313)