STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenue:
Revenue	$ 6,347
Operating expenses:
Research and development	34,216	$ 19,787
General and administrative	9,613	3,409
Total operating expenses	43,829	23,196
Loss from operations	(37,482)	(23,196)
Other income, net	3,745	397
Net loss	$ (33,737)	$ (22,799)
Net loss per common share—basic and diluted (in dollars per share)	$ (2.15)	$ (16.64)
Weighted average number of common shares —basic and diluted (in shares)	15,695,461	1,369,846
Comprehensive loss:
Net loss	$ (33,737)	$ (22,799)
Unrealized loss on marketable securities	(38)
Total comprehensive loss	$ (33,775)	$ (22,799)