Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Series 4 Convertible Preferred Stock	Series 5 Convertible Preferred Stock	Series 6 Convertible Preferred Stock	Common Stock	Additional Paid-In Capital	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Non-Controlling Interest
Balance, beginning (in shares) at Dec. 31, 2019		1	126	0	4,234,923		1
Balance, beginning at Dec. 31, 2019	$ 6,052	$ 0	$ 0	$ 0	$ 4	$ 158,383	$ (695)	$ 96	$ (151,762)	$ 26
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued for registered offering (in shares)					937,010
Shares issued for registered offering	1,252				$ 1	1,251
Common shares issued for extinguishment of debt (in shares)					1,896,557
Common shares issued for extinguishment of debt	4,194					4,192
Stock options granted to employees and consultants for services	399				$ 2	399
Cumulative Translation Adjustment	(614)							(613)		(1)
Net Loss	(6,168)								(6,158)	(10)
Balance, ending (in shares) at Mar. 31, 2020		1	126	0	7,068,490		1
Balance, ending at Mar. 31, 2020	5,115	$ 0	$ 0	$ 0	$ 7	164,225	$ (695)	(517)	(157,920)	15
Balance, beginning (in shares) at Dec. 31, 2020		1	126		53,178,462		1
Balance, beginning at Dec. 31, 2020	$ 44,680	$ 0	$ 0		$ 53	225,613	$ (695)	660	(180,992)	41
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued for registered offering (in shares)	4,977				15,800,000
Shares issued for registered offering	$ 74,074				$ 16	74,058
Common shares issued for extinguishment of debt (in shares)					893,921
Common shares issued for extinguishment of debt	1,500				$ 1	1,499
Common shares issued for stock options exercised (in shares)					4,977
Common shares issued for cashless stock options exercised	0
Common shares issued for net proceeds from warrants exercised (in shares)					31,505,088
Common shares issued for net proceeds from warrants exercised	3,779				$ 32	3,747
Stock options granted to employees and consultants for services	5,096					5,096
Cumulative Translation Adjustment	(671)							(671)
Net Loss	(12,539)								(12,557)	18
Balance, ending (in shares) at Mar. 31, 2021		1	126		101,382,448		1
Balance, ending at Mar. 31, 2021	$ 115,919	$ 0	$ 0		$ 102	$ 310,013	$ (695)	$ (11)	$ (193,549)	$ 59