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
Operating expenses:
Research and development	$ 19,686	$ 15,630	$ 39,535	$ 25,761
General and administrative	5,052	4,921	10,311	9,529
Total operating expenses	24,738	20,551	49,846	35,290
Loss from operations	(24,738)	(20,551)	(49,846)	(35,290)
Other expenses, net	(316)	(172)	(772)	(215)
Net loss before tax	(25,054)	(20,723)	(50,618)	(35,505)
Income tax expense			(1)
Net loss	(25,054)	(20,723)	(50,619)	(35,505)
Other comprehensive (loss) income:
Unrealized (loss) gain on available-for-sale securities	(77)	13	(272)	9
Foreign currency translation adjustments	15	(6)	18	5
Total other comprehensive (loss) income	(62)	7	(254)	14
Comprehensive loss	$ (25,116)	$ (20,716)	$ (50,873)	$ (35,491)
Net loss per share, basic	$ (1.23)	$ (1.03)	$ (2.49)	$ (1.77)
Net loss per share, diluted	$ (1.23)	$ (1.03)	$ (2.49)	$ (1.77)
Weighted-average shares used to compute net loss per share, basic	20,351,560	20,060,061	20,345,521	20,017,677
Weighted-average shares used to compute net loss per share, diluted	20,351,560	20,060,061	20,345,521	20,017,677