Selected Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2018

Selected Quarterly Financial Information [Abstract]

Schedule of Selected Quarterly Results from Operations

Selected quarterly results from operations for the years ended December 31, 2018 and 2017 are as follows (in thousands, except per share amounts):

	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	)

	2017 Quarter Ended
	March 31,			June 30,			September30,			December31,
Grant revenues	$	982		$	1,479		$	1,261		$	1,483
Loss from operations		(6,331	)		(6,720	)		(7,998	)		(6,627	)
Net loss		(6,247	)		(6,632	)		(7,874	)		(6,483	)
Basic and diluted net loss per common share	$	(0.47	)	$	(0.47	)	$	(0.48	)	$	(0.39	)