STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Revenue:
Total revenue	$ 320	$ 2,361
Operating expenses:
Research and development	72,088	30,911
General and administrative	13,088	11,186
Total operating expenses	85,176	42,097
Loss from operations	(84,856)	(39,736)
Other (expense) income:
Loss from remeasurement of development derivative liability	(12,507)	0
Interest income	237	1,582
Interest expense	(1,445)	(1,076)
Foreign exchange gain (loss)	6	(17)
Total other (expense) income	(13,709)	489
Net loss	$ (98,565)	$ (39,247)
Net loss per common share, basic and diluted (in usd per share)	$ (3.39)	$ (1.43)
Weighted-average common shares outstanding, basic and diluted (in shares)	29,056,304	27,493,558
Grant revenue
Revenue:
Total revenue	$ 320	$ 1,786
Revenue under collaborative agreement
Revenue:
Total revenue	$ 0	$ 575