Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Expenses
Research and development	$ 14,210	$ 11,713
General and administrative	7,123	2,518
Total expenses	21,333	14,231
Interest and other income (expense)
Other income	231	165
Interest income	685	545
Interest expense	(1)	(2)
Preferred stock warrant liability revaluation		(50)
Loss on disposal of property and equipment		(5)
Loss before income tax expense	(20,418)	(13,578)
Income tax expense		1
Net loss	$ (20,418)	$ (13,579)
Net loss per share, basic and diluted	$ (0.73)	$ (6.40)
Weighted-average shares used in computing net loss per share, basic and diluted	28,020,408	2,120,925