CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Series O Preferred Stock	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit	Noncontrolling Interest
Beginning Balance (in shares) at Dec. 31, 2018		13	57,986
Beginning Balance at Dec. 31, 2018	$ 52,939	$ 0	$ 58	$ 2,294,025	$ (10,643)	$ (2,224,746)	$ (5,755)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-based compensation (in shares)			(7)
Equity-based compensation	1,257			1,257
Net loss	(10,814)					(10,814)
Other comprehensive income	9				9
Ending Balance (in shares) at Mar. 31, 2019		13	57,979
Ending Balance at Mar. 31, 2019	44,587	$ 0	$ 58	2,295,275	(10,634)	(2,234,357)	(5,755)
Beginning Balance (in shares) at Dec. 31, 2019		13	57,980
Beginning Balance at Dec. 31, 2019	17,930	$ 0	$ 58	2,299,186	(11,993)	(2,263,563)	(5,758)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock, net of issuance costs (in shares)			15,699
Issuance of common stock, net of issuance costs	15,470		$ 16	15,454
Conversion of Series X preferred stock to common stock (in shares)			3
Conversion of Series X preferred stock to common stock	3			3
Equity-based compensation	1,167			1,167
Net loss	(12,186)					(12,186)
Other comprehensive income	0
Ending Balance (in shares) at Mar. 31, 2020		13	73,682
Ending Balance at Mar. 31, 2020	$ 22,384	$ 0	$ 74	$ 2,315,810	$ (11,993)	$ (2,275,749)	$ (5,758)