Condensed Consolidated 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	$ 13,707	$ 8,635	$ 26,942	$ 18,625
General and administrative	3,414	3,633	7,118	7,195
Total operating expenses	17,121	12,268	34,060	25,820
Loss from operations	(17,121)	(12,268)	(34,060)	(25,820)
Other income (expense), net
Interest income, net	156	52	217	91
Loss on sale of marketable securities	(70)		(70)
Foreign exchange transaction gain (loss), net	148	(86)	88	82
Total other income, net	234	(34)	235	173
Net loss	$ (16,887)	$ (12,302)	$ (33,825)	$ (25,647)
Net loss per common share, basic and diluted	$ (0.67)	$ (0.49)	$ (1.34)	$ (1.02)
Weighted-average number of shares used in computing net loss per common share, basic and diluted	25,270,314	25,261,832	25,266,096	25,261,832
Other comprehensive loss, net of tax
Currency translation gain (loss)	$ (719)	$ 153	$ (889)	$ (371)
Unrealized gain (loss) on marketable securities	(155)	23	(360)	(57)
Reclassification adjustment for loss included in net income	70		70
Other comprehensive loss, net of tax	(804)	176	(1,179)	(428)
Total comprehensive loss	$ (17,691)	$ (12,126)	$ (35,004)	$ (26,075)