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Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Operating expenses:
Research and development	$ 41,846	$ 40,148	$ 121,944	$ 100,807
In process research and development	275	0	18,080	2,000
General and administrative	11,448	9,838	33,851	27,544
Total operating expenses	53,569	49,986	173,875	130,351
Loss from operations	(53,569)	(49,986)	(173,875)	(130,351)
Other income (expense), net	(4,243)	1,486	(4,881)	4,742
Net loss	(57,812)	(48,500)	(178,756)	(125,609)
Other comprehensive income:
Foreign currency translation, net of tax	68	0	59	0
Unrealized gain (loss) on marketable securities, net of tax	(293)	(168)	25	389
Other comprehensive income (loss)	(225)	(168)	84	389
Comprehensive loss	$ (58,037)	$ (48,668)	$ (178,672)	$ (125,220)
Net loss per share, basic and diluted (in dollars per share)	$ (0.80)	$ (0.80)	$ (2.67)	$ (2.39)
Weighted average common shares outstanding, basic and diluted (in shares)	72,245,897	60,755,872	66,931,512	52,535,569

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