CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS
Federal contract revenue	$ 1,127	$ 171	$ 4,838	$ 171
Collaboration revenue	8,987		8,987
Total revenue	10,114	171	13,825	171
Expenses:
Research and development	18,353	11,306	55,506	38,062
General and administrative	9,452	4,564	26,656	12,543
Cost of collaboration revenue	1,478		1,478
Loss from operations	(19,169)	(15,699)	(69,815)	(50,434)
Interest income	17	79	57	459
Interest expense	(678)		(1,029)
Other income (expense), net	323	(39)	316	(31)
Net loss and comprehensive loss	(19,507)	(15,659)	(70,471)	(50,006)
Deemed dividends on convertible preferred stock				(8,880)
Net loss applicable to common shareholders	$ (19,507)	$ (15,659)	$ (70,471)	$ (58,886)
Per share information:
Net loss per share of common stock-basic	$ (0.53)	$ (0.51)	$ (1.92)	$ (2.29)
Net loss per share of common stock-diluted	$ (0.54)	$ (0.51)	$ (1.93)	$ (2.29)
Basic weighted average shares outstanding	36,744,591	30,552,947	36,667,472	25,737,981
Diluted weighted average shares outstanding	36,744,591	30,552,947	36,667,472	25,737,981
Net loss	$ (19,507)	$ (15,659)	$ (70,471)	$ (50,006)
Other comprehensive (loss) income:
Unrealized (loss) gain on available-for-sale securities		(15)		11
Total comprehensive loss	$ (19,507)	$ (15,674)	$ (70,471)	$ (49,995)