CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS
Federal contract revenue	$ 1,806
Expenses:
Research and development	18,591	$ 15,004
General and administrative	10,376	3,850
Loss from operations	(27,161)	(18,854)
Interest income	24	222
Other expense, net	(4)	(40)
Net loss and comprehensive loss	(27,141)	(18,672)
Deemed dividends on convertible preferred stock		(8,880)
Net loss and comprehensive loss applicable to common shareholders	$ (27,141)	$ (27,552)
Per share information:
Net loss per share of common stock-basic and diluted	$ (0.74)	$ (1.27)
Basic and diluted weighted average shares outstanding	36,599,701	21,665,461
Net loss	$ (27,141)	$ (18,672)