Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Total revenues	$ 111	$ 109	$ 220	$ 217
General and administrative	3,285	2,300	6,209	4,828
Depreciation	66	64	132	130
Total costs and expenses	3,351	2,364	6,341	4,958
Operating loss	(3,240)	(2,255)	(6,121)	(4,741)
Interest expense, net	(4,303)	(3,822)	(8,537)	(7,338)
Interest income	69	48	122	80
Loss before income taxes	(7,474)	(6,029)	(14,733)	(11,999)
Income tax expense	2	3	3	4
Net loss and comprehensive loss applicable to common stock	$ (7,476)	$ (6,032)	$ (14,736)	$ (12,003)
Basic and diluted net loss per common share (in dollars per share)	$ (0.28)	$ (0.25)	$ (0.57)	$ (0.51)
Basic and diluted weighted average shares outstanding (in shares)	26,479	23,883	25,906	23,482
Debt conversion expense			$ (197)