Selected Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2019

Selected Quarterly Financial Information [Abstract]

Schedule of Selected Quarterly Results from Operations

Selected quarterly results from operations for the years ended December 31, 2019 and 2018 are as follows (in thousands, except per share amounts):

	2019 Quarter Ended
	March 31,			June 30,			September30,			December31,
Loss from operations	$	(17,657	)	$	(18,622	)	$	(22,146	)	$	(21,909	)
Net loss		(17,167	)		(18,019	)		(21,573	)		(21,495	)
Basic and diluted net loss per common share	$	(0.59	)	$	(0.55	)	$	(0.66	)	$	(0.65	)

	2018 Quarter Ended
	March 31,			June 30,			September30,			December31,
Grant revenues	$	1,510		$	2,378		$	—		$	—
Loss from operations		(8,245	)		(9,670	)		(12,243	)		(15,305	)
Net loss		(8,119	)		(9,414	)		(11,917	)		(14,898	)
Basic and diluted net loss per common share	$	(0.49	)	$	(0.46	)	$	(0.54	)	$	(0.62	)