Selected Quarterly Financial Data

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Selected Quarterly Financial Data

9. Selected Quarterly Financial Data

(in thousands, except per share data) (unaudited)	First Quarter			Second Quarter			Third Quarter			Fourth Quarter
2017
Revenues	$	1,027		$	1,026		$	1,026		$	1,027
Total operating expenses		10,998			10,596			11,366			13,271
Net loss		(10,126	)		(9,645	)		(10,684	)		(12,497	)
Basic and diluted net loss per common share	$	(0.24	)	$	(0.23	)	$	(0.26	)	$	(0.29	)
2016
Revenues	$	1,322		$	1,027		$	1,026		$	1,027
Total operating expenses		9,238			9,031			9,415			8,681
Net loss		(8,377	)		(8,408	)		(8,737	)		(7,940	)
Basic and diluted net loss per common share	$	(0.29	)	$	(0.29	)	$	(0.27	)	$	(0.21	)