Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating expenses:
Research and development	$ 8,791	$ 4,063
General and administrative	3,588	1,449
Total operating expenses	12,379	5,512
Loss from operations	(12,379)	(5,512)
Other income (expense):
Interest income	493	166
Other expenses		(16)
Total other income, net	493	150
Net loss	(11,886)	(5,362)
Net unrealizable gain on marketable securities	51
Comprehensive loss	$ (11,835)	$ (5,362)
Net loss per common share, basic and diluted	$ (0.42)	$ (31.90)
Weighted-average number of shares used in computing net loss per common share, basic and diluted	28,499,475	168,071