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Condensed Consolidated Statements of Operations and Comprehensive Loss (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Operating expenses:
Research and development	$ 22,118	$ 6,765	$ 47,523	$ 26,716
General and administrative	3,043	2,267	8,498	6,629
Total operating expenses	25,161	9,032	56,021	33,345
Loss from operations	(25,161)	(9,032)	(56,021)	(33,345)
Other income, net	725	625	2,203	1,488
Loss before income taxes	(24,436)	(8,407)	(53,818)	(31,857)
Income tax expense	12		31
Net loss	$ (24,448)	$ (8,407)	$ (53,849)	$ (31,857)
Net loss per share, basic and diluted	$ (0.68)	$ (0.30)	$ (1.51)	$ (1.23)
Weighted-average common shares used in computing net loss per share, basic and diluted	36,217,040	28,046,723	35,585,980	25,895,933
Other comprehensive gain (loss):
Net loss	$ (24,448)	$ (8,407)	$ (53,849)	$ (31,857)
Unrealized (loss) gain on marketable securities	(61)	(46)	150	(76)
Comprehensive loss	$ (24,509)	$ (8,453)	$ (53,699)	$ (31,933)

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