Condensed Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Operating expenses:
Research and development	$ 1,741	$ 3,845	$ 7,805	$ 13,082
General and administrative	2,453	2,359	6,169	8,095
Total operating expenses	4,194	6,204	13,974	21,177
Loss from operations	(4,194)	(6,204)	(13,974)	(21,177)
Other (expense) income:
Interest expense	(30)	(223)	(76)	(755)
Interest income		3		29
Other income (expense), net	128	(176)	128	(359)
Reorganization items, net	(427)		(8,039)
Net loss	(4,523)	(6,600)	(21,961)	(22,262)
Other comprehensive income:
Net unrealized gains on marketable securities				8
Comprehensive loss	$ (4,523)	$ (6,600)	$ (21,961)	$ (22,254)
Basic and diluted net loss per common share	$ (0.30)	$ (1.60)	$ (2.76)	$ (5.40)
Weighted average common shares outstanding used to calculate basic and diluted net loss per common share	14,879,519	4,124,026	7,950,826	4,124,096