Consolidated Statements Of Redeemable Preferred Stock and Stockholders' Equity (Unaudited) - USD ($)	Total	Series F Convertible Preferred Stock	Common Stock	Additional Paid-in Capital	Convertible Preferred Stock Series F Convertible Preferred Stock	Accumulated Other Comprehensive Loss	Accumulated Deficit	Mezzanine Equity Series G Redeemable Preferred Stock
Beginning balance at Dec. 31, 2020	$ 10,028,000		$ 4,000	$ 261,667,000	$ 118,000	$ (385,000)	$ (251,376,000)
Balance (in shares) at Dec. 31, 2020			3,908,000		1,000
Conversion of Series F Convertible Preferred Stock			$ 63,000	630,000	$ (630,000)
Conversion of Series F Convertible Preferred Stock, shares					(1,000)
Sale of common stock	13,291,000		$ 1,000	13,290,000
Sale of common stock, shares			560,000
Exercise of stock option	66,000		$ 7,000	66,000
Issuance of restricted shares	164,000		10,000	164,000
Issuance of common stock for settlement of liability	510,000		20,000	510,000
Deemed dividend on Series F Convertible Preferred Stock	546,000			(546,000)	$ 546,000
Stock-based compensation	2,253,000		0	2,253,000
Issuance of stock from RSUs, net			135,000
Exercise of common stock warrants	15,062,000		$ 1,000	15,061,000
Exercise of common stock warrants, shares			1,429,000
Net loss	(10,879,000)						(10,879,000)
Foreign currency translation adjustments	(173,000)					(173,000)
Ending balance at Sep. 30, 2021	30,322,000		$ 6,000	293,095,000	34,000	(558,000)	(262,255,000)
Ending Balance (in shares) at Sep. 30, 2021			6,132,000
Beginning balance at Jun. 30, 2021	33,256,000		$ 6,000	292,662,000	35,000	(468,000)	(258,979,000)
Balance (in shares) at Jun. 30, 2021			6,049,000
Conversion of Series F Convertible Preferred Stock			$ 1,000	10,000	(10,000)
Exercise of stock option	66,000		7,000	66,000
Issuance of restricted shares	164,000		10,000	164,000
Deemed dividend on Series F Convertible Preferred Stock	9,000		0	(9,000)	9,000
Stock-based compensation	192,000		$ 0	192,000
Exercise of common stock warrants	10,000			10,000
Exercise of common stock warrants, shares			1,000
Net loss	(3,276,000)						(3,276,000)
Foreign currency translation adjustments	(90,000)					(90,000)
Ending balance at Sep. 30, 2021	30,322,000		$ 6,000	293,095,000	34,000	(558,000)	(262,255,000)
Ending Balance (in shares) at Sep. 30, 2021			6,132,000
Beginning balance at Dec. 31, 2021	$ 25,208,000		$ 6,000	293,325,000	34,000	(623,000)	(267,534,000)
Balance (in shares) at Dec. 31, 2021	7,142,000		6,149,000
Issuance of Series G Redeemable Preferred Stock, shares								154,000
Conversion of Series F Convertible Preferred Stock				251,000	(251,000)
Conversion of Series F Convertible Preferred Stock, shares			25,000
Sale of common stock	$ 5,635,000		$ 1,000	5,634,000
Sale of common stock, shares			679,000
Redemption of Series G Redeemable Preferred Stock, shares								(154,000)
Deemed dividend on Series F Convertible Preferred Stock	217,000			(217,000)	$ 217,000
Stock-based compensation	1,607,000			1,607,000
Issuance of stock from RSUs, net, shares			113,000
Liability award reclass	596,000			596,000
Exercise of common stock warrants, shares			178,000
Net loss	(18,773,000)						(18,773,000)
Foreign currency translation adjustments	(415,000)					(415,000)
Ending balance at Sep. 30, 2022	$ 13,858,000		$ 7,000	301,196,000		(1,038,000)	(286,307,000)
Ending Balance (in shares) at Sep. 30, 2022	7,144,000		7,144,000
Ending balance, shares at Sep. 30, 2022		0
Beginning balance at Jun. 30, 2022	$ 21,615,000		$ 7,000	300,414,000		(886,000)	(277,920,000)
Balance (in shares) at Jun. 30, 2022			6,857,000
Sale of common stock	(214,000)			(214,000)
Deemed dividend on Series F Convertible Preferred Stock	0
Stock-based compensation	996,000			996,000
Issuance of stock from RSUs, net, shares			109,000
Exercise of common stock warrants, shares			178,000
Net loss	(8,387,000)						(8,387,000)
Foreign currency translation adjustments	(152,000)					(152,000)
Ending balance at Sep. 30, 2022	$ 13,858,000		$ 7,000	$ 301,196,000		$ (1,038,000)	$ (286,307,000)
Ending Balance (in shares) at Sep. 30, 2022	7,144,000		7,144,000
Ending balance, shares at Sep. 30, 2022		0