Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Total revenues (rental income)	$ 440	$ 437
Costs and expenses:
General and administrative	11,402	12,803
Depreciation	258	274
Total costs and expenses	11,660	13,077
Operating loss	(11,220)	(12,640)
Interest expense	(15,270)	(17,770)
Interest income	223	51
Loss on extinguishment of debt and debt refinancing		(3,501)
Loss before income taxes	(26,267)	(33,860)
Income tax expense	6	4
Net loss and comprehensive loss	$ (26,273)	$ (33,864)
Basic and diluted net loss per share (in dollars per share)	$ (1.09)	$ (1.50)
Weighted-average shares outstanding (in shares)	23,998	22,535