CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
COSTS AND EXPENSES:
Research and development	$ 3,908	$ 5,466	$ 9,708	$ 23,653
General and administrative	1,927	2,143	6,040	7,806
Total costs and expenses	5,835	7,609	15,748	31,459
Operating loss	(5,835)	(7,609)	(15,748)	(31,459)
Interest income, net	49	31	118	99
NET LOSS	$ (5,786)	$ (7,578)	$ (15,630)	$ (31,360)
Net loss per common share, basic and diluted (in dollars per share)	$ (0.77)	$ (2.90)	$ (2.49)	$ (14.52)
Weighted average common shares outstanding, basic and diluted (in shares)	7,508,036	2,613,109	6,287,062	2,160,157