Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Operating expenses:
Research and development	$ 6,029	$ 2,157	$ 9,384	$ 3,940
General and administrative	8,978	513	10,285	1,017
Total operating expenses	15,007	2,670	19,669	4,957
Loss from operations	(15,007)	(2,670)	(19,669)	(4,957)
Other income (expense):
Interest income (expense)	34	0	34	(1)
Other income (expense), net	259	0	608	25
Total other income	293	0	642	24
Net loss	$ (14,714)	$ (2,670)	$ (19,027)	$ (4,933)
Net loss per share, basic and diluted (in USD per share)	$ (1.52)	$ (3.15)	$ (3.60)	$ (5.82)
Weighted-average common shares outstanding, basic and diluted (in shares)	9,669,129	846,953	5,282,412	846,953