CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue:
Total revenue	$ 475,598	$ 18,662	$ 34,288
Expenses:
Research and development	747,027	113,842	173,797
Gain on sale of assets	0	(9,016)	0
General and administrative	145,290	34,417	34,409
Total expenses	892,317	139,243	208,206
Loss from operations	(416,719)	(120,581)	(173,918)
Other income (expense):
Investment income	1,014	1,512	2,674
Interest expense	(15,145)	(13,612)	(13,612)
Other income (expense)	12,591	(13)	108
Net loss	$ (418,259)	$ (132,694)	$ (184,748)
Basic and diluted net loss per share (in usd per share)	$ (7.27)	$ (5.51)	$ (9.99)
Basic and diluted weighted average number of common shares outstanding (in shares)	57,554	24,100	18,488
Government contracts
Revenue:
Government contracts	$ 217,246	$ 7,500	$ 0
Grants and other
Revenue:
Total revenue	$ 258,352	$ 11,162	$ 34,288