Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Expenses
Research and development	$ 16,808	$ 12,812	$ 45,198	$ 40,447
General and administrative	6,614	4,864	20,195	10,919
Total expenses	23,422	17,676	65,393	51,366
Interest and other income (expense)
Other income	353	619	987	1,805
Interest income	142	1,189	1,082	2,328
Interest expense	(1)	(1)	(3)	(5)
Preferred stock warrant liability revaluation				(123)
Foreign exchange loss		(1)		(1)
Loss on disposal of property and equipment				(7)
Loss before income tax expense	(22,928)	(15,870)	(63,327)	(47,369)
Income tax expense	(1)	(1)	(1)	(2)
Net loss	$ (22,929)	$ (15,871)	$ (63,328)	$ (47,371)
Net loss per share, basic and diluted	$ (0.66)	$ (0.57)	$ (2.09)	$ (4.03)
Weighted-average shares used in computing net loss per share, basic and diluted	34,723,888	27,949,682	30,313,047	11,747,825