CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenue	$ 34,028	$ 3,107
Operating expenses:
Research and development	43,171	21,603
General and administrative	16,023	9,676
Total operating expenses	59,194	31,279
Loss from operations	(25,166)	(28,172)
Other income (expense):
Interest income	2,613	2,018
Interest expense	(4)	0
Other income	65	0
Total other income, net	2,674	2,018
Net loss	$ (22,492)	$ (26,154)
Net loss per share – basic and diluted (in dollars per share)	$ (0.31)	$ (0.38)
Weighted average common shares outstanding – basic and diluted (in shares)	72,919,378	68,259,354