Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Total revenues	$ 109	$ 108
Costs and expenses:
General and administrative	2,924	2,528
Depreciation	66	66
Total costs and expenses	2,990	2,594
Operating loss	(2,881)	(2,486)
Interest expense, net	(4,234)	(3,516)
Interest income	53	32
Debt conversion expense	(197)
Loss before income taxes	(7,259)	(5,970)
Income tax expense	1	1
Net loss and comprehensive loss applicable to common stock	$ (7,260)	$ (5,971)
Basic and diluted net loss per common share (in dollars per share)	$ (0.29)	$ (0.26)
Basic and diluted weighted average shares outstanding (in shares)	25,327	23,075