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Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating expenses:
Research and development	$ 69,282	$ 40,480
General and administrative	29,504	8,171
Operating loss	(98,786)	(48,651)
Loss on extinguishment of debt		(1,208)
Loss from remeasurement of development derivative liability	(68,406)	(736)
Interest income	2,275	867
Interest expense	(3,919)	(593)
Other income/(expense), net	14	(253)
Net loss	(168,822)	(50,574)
Other comprehensive gain:
Unrealized gain on marketable securities	1,394
Foreign currency gain/ (loss)	(230)	2
Total other comprehensive gain/ (loss)	1,164	2
Comprehensive loss, net of tax	$ (167,658)	$ (50,572)
Net loss per common share, basic and diluted	$ (2.29)	$ (0.87)
Weighted-average number of common shares used in net loss per common share, basic and diluted	73,720	57,897

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