Condensed Consolidated Statements of Stockholders' (Deficit) Equity - USD ($) $ in Thousands	Common Stock	Additional Paid-in-Capital	Accumulated Other Comprehensive Income	Treasury Stock	Accumulated Deficit	Total
Balance at Dec. 31, 2018	$ 2,342	$ 1,289,714	$ 1,584	$ (30,637)	$ (1,260,290)	$ 2,713
Balance (in shares) at Dec. 31, 2018	234,160,661			15,002,663
Increase (Decrease) in Stockholders' Equity
Net loss attributable to the Company					(30,952)	(30,952)
Other comprehensive loss			(210)			(210)
Stock-based compensation	$ 3	2,494				2,497
Stock-based compensation (in shares)	324,073
Stock dividend		13			(13)
Stock dividend (in shares)	5,034
Issuance of common stock, net	$ 100	23,398				23,498
Issuance of common stock, net (in shares)	10,000,000
Stock option exercises		81				81
Stock option exercises (in shares)	47,467
Provision for common stock warrants		1,193				1,193
Balance at Mar. 31, 2019	$ 2,445	1,316,893	1,374	$ (30,637)	(1,291,255)	(1,180)
Balance (in shares) at Mar. 31, 2019	244,537,235			15,002,663
Balance at Dec. 31, 2018	$ 2,342	1,289,714	1,584	$ (30,637)	(1,260,290)	2,713
Balance (in shares) at Dec. 31, 2018	234,160,661			15,002,663
Balance at Dec. 31, 2019	$ 3,186	1,507,116	1,400	$ (31,216)	(1,345,807)	$ 134,679
Balance (in shares) at Dec. 31, 2019	318,637,560			15,259,045		318,637,560
Increase (Decrease) in Stockholders' Equity
Net loss attributable to the Company					(37,479)	$ (37,479)
Other comprehensive loss			(236)			(236)
Stock-based compensation	$ 2	3,051		$ (8)		3,045
Stock-based compensation (in shares)	156,416			1,962
Stock dividend		13			(13)
Stock dividend (in shares)	3,857
Stock option exercises	$ 32	6,072				6,104
Stock option exercises (in shares)	3,206,185
Provision for common stock warrants		2,566				2,566
Accretion of discount, preferred stock		(28)				(28)
Conversion of preferred stock	$ 2	467				469
Conversion of preferred stock (in shares)	216,451
Balance at Mar. 31, 2020	$ 3,222	$ 1,519,257	$ 1,164	$ (31,224)	$ (1,383,299)	$ 109,120
Balance (in shares) at Mar. 31, 2020	322,220,469			15,261,007		322,220,469