CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Revenue	$ 886	$ 869	$ 1,527	$ 2,091
Operating expenses:
Research and development	14,359	13,190	31,029	26,961
General and administrative	5,436	3,760	10,184	7,772
Total operating expenses	19,795	16,950	41,213	34,733
Loss from operations	(18,909)	(16,081)	(39,686)	(32,642)
Other income (expense), net	(275)	(29)	34	18
Net loss	(19,184)	(16,110)	(39,652)	(32,624)
Other comprehensive income (loss):
Foreign currency translation gain	550	70	349	108
Unrealized loss on marketable securities	(178)	(18)	(888)	(68)
Total comprehensive loss	$ (18,812)	$ (16,058)	$ (40,191)	$ (32,584)
Net loss per share, basic	$ (0.62)	$ (0.63)	$ (1.31)	$ (1.29)
Net loss per share, diluted	$ (0.62)	$ (0.63)	$ (1.31)	$ (1.29)
Weighted average number of shares used in computing net loss per share, basic	31,140,323	25,589,947	30,356,515	25,217,542
Weighted average number of shares used in computing net loss per share, diluted	31,140,323	25,589,947	30,356,515	25,217,542