Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Total revenues (rental income)	$ 437	$ 412	$ 304
Costs and expenses:
Cost of sales (exclusive of depreciation shown below)			334
General and administrative	12,803	9,330	13,709
Depreciation	274	292	270
Total costs and expenses	13,077	9,622	14,313
Operating loss	(12,640)	(9,210)	(14,009)
Interest expense, net	(17,719)	(14,875)	(10,070)
Loss on extinguishment of debt and debt refinancing	(3,501)	(2,250)
Other income, net			70
Loss before income taxes	(33,860)	(26,335)	(24,009)
Income tax expense	4	4	4
Net loss and comprehensive loss	$ (33,864)	$ (26,339)	$ (24,013)
Basic and diluted net loss per share (in dollars per share)	$ (1.50)	$ (1.41)	$ (1.35)
Weighted-average shares outstanding (in shares)	22,535	18,719	17,782