CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit	Noncontrolling Interest
Beginning Balance (in shares) at Dec. 31, 2017		1	42,969
Beginning Balance at Dec. 31, 2017	$ 16,090	$ 0	$ 43	$ 2,223,388	$ (6,272)	$ (2,195,346)	$ (5,723)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock, net of issuance costs (in shares)			23,012
Issuance of common stock, net of issuance costs	64,189		$ 23	64,166
Exchange of common stock for preferred stock (in shares)		12	(8,000)
Exchange of common stock for preferred stock	0		$ (8)	8
Value of beneficial conversion features related to preferred stock	0			80		(80)
Equity-based compensation	1,336			1,336
Other	(1)			(1)
Noncontrolling interest	(14)						(14)
Net loss	(4,021)					(4,021)
Other comprehensive income (loss)	(532)				(532)
Ending Balance (in shares) at Mar. 31, 2018		13	57,981
Ending Balance at Mar. 31, 2018	77,047	$ 0	$ 58	2,288,977	(6,804)	(2,199,447)	(5,737)
Beginning Balance (in shares) at Dec. 31, 2017		1	42,969
Beginning Balance at Dec. 31, 2017	16,090	$ 0	$ 43	2,223,388	(6,272)	(2,195,346)	(5,723)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(15,357)
Other comprehensive income (loss)	(3,626)
Ending Balance (in shares) at Jun. 30, 2018		13	57,985
Ending Balance at Jun. 30, 2018	63,648	$ 0	$ 58	2,290,017	(9,898)	(2,210,783)	(5,746)
Beginning Balance (in shares) at Mar. 31, 2018		13	57,981
Beginning Balance at Mar. 31, 2018	77,047	$ 0	$ 58	2,288,977	(6,804)	(2,199,447)	(5,737)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock, net of issuance costs	(19)			(19)
Equity-based compensation	1,040			1,040
Other (in shares)			4
Other	19			19
Noncontrolling interest	(9)						(9)
Net loss	(11,336)					(11,336)
Other comprehensive income (loss)	(3,094)				(3,094)
Ending Balance (in shares) at Jun. 30, 2018		13	57,985
Ending Balance at Jun. 30, 2018	63,648	$ 0	$ 58	2,290,017	(9,898)	(2,210,783)	(5,746)
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 (loss)	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, 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]
Net loss	(21,785)
Other comprehensive income (loss)	21
Ending Balance (in shares) at Jun. 30, 2019		13	57,979
Ending Balance at Jun. 30, 2019	34,985	$ 0	$ 58	2,296,637	(10,622)	(2,245,328)	(5,760)
Beginning Balance (in shares) at Mar. 31, 2019		13	57,979
Beginning Balance at Mar. 31, 2019	44,587	$ 0	$ 58	2,295,275	(10,634)	(2,234,357)	(5,755)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Equity-based compensation (in shares)			0
Equity-based compensation	1,361			1,361
Other	1			1
Noncontrolling interest	(5)						(5)
Net loss	(10,971)					(10,971)
Other comprehensive income (loss)	12				12
Ending Balance (in shares) at Jun. 30, 2019		13	57,979
Ending Balance at Jun. 30, 2019	$ 34,985	$ 0	$ 58	$ 2,296,637	$ (10,622)	$ (2,245,328)	$ (5,760)