Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Total revenues (rental income)	$ 541	$ 441
Costs and expenses:
General and administrative	11,914	12,165
Depreciation	381	265
Total costs and expenses	12,295	12,430
Operating loss	(11,754)	(11,989)
Interest expense, net	(11,526)	(17,072)
Other income	33	226
Debt conversion expense	0	(197)
Loss on extinguishment of debt	(12,394)	0
Loss before income taxes	(35,641)	(29,032)
Income tax expense	(7)	(6)
Loss from equity-method investments	(2,169)	(490)
Net loss and comprehensive loss applicable to common stock	$ (37,817)	$ (29,528)
Basic and diluted net loss per common share (in dollars per share)	$ (1.11)	$ (1.11)
Basic and diluted weighted-average shares outstanding (in shares)	34,188	26,549