Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Operating expense
Research and development	$ 1,220	$ 3,463
General and administrative	7,928	7,210
Loss on disposal of assets	0	2
Total operating expense	9,148	10,675
Loss before other expense	(9,148)	(10,675)
Other income (expense)
Interest expense, net	0	(83)
Change in fair value of warrant liabilities	222	(646)
Loss on extinguishment of debt	0	(422)
Amendment of equity classified warrants	(293)	0
Other income, net	1	77
Total other expense	(70)	(1,074)
Loss from continuing operations	(9,218)	(11,749)
(Loss) income from discontinued operations	(24)	12,070
Net (loss) income	$ (9,242)	$ 321
Basic and diluted earnings (loss) per share
Continuing operations (in usd per share)	$ (12.11)	$ (29.64)
Discontinued operations (in usd per share)	(0.03)	30.45
Total earnings (loss) per share (in usd per share)	$ (12.14)	$ 0.81
Weighted average common shares outstanding for basic and diluted earnings (loss) per share (in shares)	761	396