Selected Quarterly Financial Data (Unaudited)

12 Months Ended

Dec. 31, 2018

Selected Quarterly Financial Information [Abstract]

Selected Quarterly Financial Data (Unaudited)

17.  Selected Quarterly Financial Data (Unaudited)

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	)