Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating expenses:
Research and development	$ 72,324	$ 25,389	$ 24,390
General and administrative	22,648	15,293	7,672
Total operating expenses	94,972	40,682	32,062
Loss from operations	(94,972)	(40,682)	(32,062)
Interest income	11,024	7,671	558
Other income		200	350
Net loss	$ (83,948)	$ (32,811)	$ (31,154)
Net loss per common share:
Basic and diluted net loss per common share (in dollars per share)	$ (5.45)	$ (2.22)	$ (2.54)
Basic and diluted weighted average number of common shares outstanding	15,394,659	14,796,712	12,244,939