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Condensed Consolidated Statements of Operations and Comprehensive Loss (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Operating expenses
Research and development	$ 56,002	$ 29,306	$ 141,743	$ 70,033
General and administrative	11,533	7,357	32,259	19,132
Total operating expenses	67,535	36,663	174,002	89,165
Loss from operations	(67,535)	(36,663)	(174,002)	(89,165)
Interest income	40	645	270	2,551
Interest expense	(6)	(6)	(17)	(19)
Other income (expense), net	(25)	(98)	(76)	120
Net loss	$ (67,526)	$ (36,122)	$ (173,825)	$ (86,513)
Net loss per common share, basic and diluted	$ (1.30)	$ (0.80)	$ (3.36)	$ (1.92)
Weighted-average common shares outstanding used in computing net loss per common share, basic and diluted	51,875,315	45,119,885	51,722,611	44,972,085
Other comprehensive income (loss)
Change in unrealized gains related to available-for-sale debt securities, net of tax	$ 0	$ (349)	$ (53)	$ 235
Total other comprehensive income (loss)	0	(349)	(53)	235
Comprehensive loss	$ (67,526)	$ (36,471)	$ (173,878)	$ (86,278)

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