CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' DEFICIT - USD ($) $ in Thousands	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]	Total
Beginning balance at Dec. 31, 2020	$ 0	$ 471	$ 142,563	$ (156,690)	$ (62)	$ (13,718)
Beginning balance (in shares) at Dec. 31, 2020	0	470,694,621
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cashless warrant exercise	$ 0	$ 11	(11)	0	0	0
Cashless warrant exercise (in shares)	0	10,925,000
Reclassification of warrant liability due to cashless warrant exercise	$ 0	$ 0	2,030	0	0	2,030
Reclassification of warrant liability due to cashless warrant exercise (in shares)	0	0
Net loss	$ 0	$ 0	0	(4,937)	0	(4,937)
Foreign currency translation adjustment	0	0	0	0	(8)	(8)
Ending balance at Mar. 31, 2021	$ 0	$ 482	144,582	(161,627)	(70)	(16,633)
Ending balance (in shares) at Mar. 31, 2021	0	481,619,621
Beginning balance at Dec. 31, 2021	$ 0	$ 482	144,582	(183,949)	(73)	(38,958)
Beginning balance (in shares) at Dec. 31, 2021	0	481,619,621
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cashless warrant exercise	$ 0	$ 14	2,152	0	0	2,166
Cashless warrant exercise (in shares)	0	14,000,000
Warrant exercise	$ 0	$ 1	99	0	0	100
Warrant exercise (in shares)	0	909,091
Shares issued in conjunction with Note Payable	$ 0	$ 20	3,700	0	0	3,720
Shares issued in conjunction with Note Payable (in shares)	0	20,666,993
Net loss	$ 0	$ 0	0	(4,423)	0	(4,423)
Foreign currency translation adjustment	0	0	0	0	6	6
Ending balance at Mar. 31, 2022	$ 0	$ 517	$ 150,533	$ (188,372)	$ (67)	$ (37,389)
Ending balance (in shares) at Mar. 31, 2022	0	517,195,705