Condensed Consolidated Statements of Operations and Comprehensive Loss (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Total revenues	$ 110	$ 112	$ 330	$ 329
Costs and expenses:
General and administrative	2,998	2,536	9,207	7,364
Depreciation	68	64	200	194
Total costs and expenses	3,066	2,600	9,407	7,558
Operating loss	(2,956)	(2,488)	(9,077)	(7,229)
Interest expense, net	(4,369)	(3,829)	(12,906)	(11,167)
Interest income	67	77	189	157
Loss before income taxes	(7,258)	(6,240)	(21,991)	(18,239)
Income tax expense	1		4	4
Loss from equity-method investments	185		185
Net loss and comprehensive loss applicable to common stock	$ (7,444)	$ (6,240)	$ (22,180)	$ (18,243)
Basic and diluted net loss per common share (in dollars per share)	$ (0.28)	$ (0.26)	$ (0.85)	$ (0.77)
Basic and diluted weighted average shares outstanding (in shares)	26,970	24,451	26,265	23,809
Total revenues	$ 110	$ 112	$ 330	$ 329
Debt conversion expense			$ (197)