CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands	Series A Convertible Redeemable Preferred	Series B Convertible Redeemable Preferred	Series E Convertible Redeemable Preferred	Series F Convertible Redeemable Preferred	Series G Convertible Redeemable Preferred	Common Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit	Total
Beginning, Shares at Dec. 31, 2016	0	239,400	12,000	2,000	6,021	91,853,499	(6,704)
Beginning, Amount at Dec. 31, 2016	$ 0	$ 2	$ 0	$ 0	$ 0	$ 917	$ (64)	$ 156,195	$ (1,543)	$ (156,767)	$ (1,260)
Issuance of Series A Convertible Redeemable Preferred Stock for cash, net of issuance costs, Shares	11,000
Issuance of Series A Convertible Redeemable Preferred Stock for cash, net of issuance costs, Amount	$ 0							10,937			10,937
Issuance of Series A Convertible Redeemable Preferred Stock in exchange for preferred shares, Shares	20,021		(12,000)	(2,000)	(6,021)
Issuance of Series A Convertible Redeemable Preferred Stock in exchange for preferred shares, Amount	$ 0		$ 0	$ 0	$ 0			1,245		(1,245)	0
Accretion of Series A Preferred Stock discount											0
Issuance of common stock warrants as compensation								57			57
Issuance of common stock pursuant to option exercises, Shares						369,004
Issuance of common stock pursuant to option exercises, Amount						$ 4		255			259
Recognition of beneficial conversion feature on convertible debt								302			302
Stock-based compensation expense								1,094			1,094
Additional minimum pension liability									(15)		(15)
Foreign currency translation adjustment									(106)		(106)
Dividends on preferred stock, Shares						1,952,037
Dividends on preferred stock, Amount						$ 20		2,329		(2,400)	(51)
Net loss										(10,069)	(10,069)
Ending, Shares at Dec. 31, 2017	31,021	239,400	0	0	0	94,174,540	(6,704)
Ending, Amount at Dec. 31, 2017	$ 0	$ 2	$ 0	$ 0	$ 0	$ 941	$ (64)	172,414	(1,664)	(170,481)	1,148
Issuance of common stock pursuant to Series A Preferred Stock conversions, Shares	(450)					391,304
Issuance of common stock pursuant to Series A Preferred Stock conversions, Amount	$ 0					$ 4		(4)			0
Related Party debt exchange for Series A Preferred Stock, Shares	6,896
Related Party debt exchange for Series A Preferred Stock, Amount	$ 0							6,802			6,802
Cumulative effect of ASC 606 adoption										96	96
Accretion of Series A Preferred Stock discount								(200)			200
Issuance of common stock warrants as compensation								26			26
Issuance of common stock pursuant to option exercises, Shares						235,852
Issuance of common stock pursuant to option exercises, Amount						$ 2		162			164
Recognition of beneficial conversion feature on convertible debt								30			30
Modification of preferred stock								92		(92)	0
Stock-based compensation expense								1,272			1,272
Additional minimum pension liability									209		209
Foreign currency translation adjustment									27		27
Dividends on preferred stock, Shares						3,428,640
Dividends on preferred stock, Amount						$ 34		3,536		(3,621)	(51)
Net loss										(12,550)	(12,550)
Ending, Shares at Dec. 31, 2018	37,467	239,400	0	0	0	98,230,336	(6,704)
Ending, Amount at Dec. 31, 2018	$ 0	$ 2	$ 0	$ 0	$ 0	$ 981	$ (64)	$ 184,130	$ (1,428)	$ (186,648)	$ (3,027)