Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Expenses
Research and development	$ 54,726	$ 32,513
General and administrative	17,845	7,060
Total expenses	72,571	39,573
Interest and other income (expense)
Other income	2,134	961
Interest income	3,213	714
Interest expense	(6)	(9)
Preferred stock warrant liability revaluation	(123)	(33)
Foreign exchange loss	(8)
Loss on disposal of property and equipment	(122)	(1)
Loss before income tax expense	(67,483)	(37,941)
Income tax benefit (expense)	(1)	1
Net loss	$ (67,484)	$ (37,940)
Net loss per share, basic and diluted	$ (4.26)	$ (18.02)
Weighted-average shares used in computing net loss per share, basic and diluted	15,834,175	2,104,861