CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands	Series A Convertible Redeemable Preferred	Series B Convertible Redeemable Preferred	Common Stock	Treasury Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit	Total
Beginning, Shares at Dec. 31, 2017	31,021	239,400	94,174,540	(6,704)
Beginning, Amount at Dec. 31, 2017	$ 0	$ 2	$ 941	$ (64)	$ 172,414	$ (1,664)	$ (170,481)	$ 1,148
Issuance of common stock pursuant to option exercises, Shares			83,169
Issuance of common stock pursuant to option exercises, Amount			$ 1		87			88
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			$ 4		(4)			0
Cumulative effect of ASC 606 adoption							96	96
Recognition of beneficial conversion feature on convertible debt					12			12
Stock-based compensation expense					335			335
Foreign currency translation adjustment						(27)		(27)
Dividends on preferred stock, Shares			472,562
Dividends on preferred stock, Amount			$ 4		750		(754)	0
Net loss							(3,583)	(3,583)
Ending, Shares at Mar. 31, 2018	30,571	239,400	95,121,575	(6,704)
Ending, Amount at Mar. 31, 2018	$ 0	$ 2	$ 950	$ (64)	173,594	(1,691)	(174,722)	(1,931)
Beginning, Shares at Dec. 31, 2017	31,021	239,400	94,174,540	(6,704)
Beginning, Amount at Dec. 31, 2017	$ 0	$ 2	$ 941	$ (64)	172,414	(1,664)	(170,481)	1,148
Accretion of Series A Preferred Stock discount								0
Stock-based compensation expense								708
Net loss								(5,869)
Ending, Shares at Jun. 30, 2018	30,571	239,400	95,835,859	(6,704)
Ending, Amount at Jun. 30, 2018	$ 0	$ 2	$ 957	$ (64)	174,749	(1,649)	(177,743)	(3,748)
Beginning, Shares at Mar. 31, 2018	30,571	239,400	95,121,575	(6,704)
Beginning, Amount at Mar. 31, 2018	$ 0	$ 2	$ 950	$ (64)	173,594	(1,691)	(174,722)	(1,931)
Issuance of common stock pursuant to option exercises, Shares			65,588
Issuance of common stock pursuant to option exercises, Amount			$ 1		60			61
Recognition of beneficial conversion feature on convertible debt					9			9
Stock-based compensation expense					373			373
Issuance of common stock warrants as compensation					9			9
Foreign currency translation adjustment						42		42
Dividends on preferred stock, Shares			648,696
Dividends on preferred stock, Amount			$ 6		704		(737)	(27)
Net loss							(2,284)	(2,284)
Ending, Shares at Jun. 30, 2018	30,571	239,400	95,835,859	(6,704)
Ending, Amount at Jun. 30, 2018	$ 0	$ 2	$ 957	$ (64)	174,749	(1,649)	(177,743)	(3,748)
Beginning, Shares at Dec. 31, 2018	37,467	239,400	98,230,336	(6,704)
Beginning, Amount at Dec. 31, 2018	$ 0	$ 2	$ 981	$ (64)	184,130	(1,428)	(186,648)	(3,027)
Accretion of Series A Preferred Stock discount					(186)			(186)
Issuance of common stock pursuant to option exercises, Shares			286,834
Issuance of common stock pursuant to option exercises, Amount			$ 3		103			106
Stock-based compensation expense					166			166
Foreign currency translation adjustment						15		15
Dividends on preferred stock, Shares			749,748
Dividends on preferred stock, Amount			$ (8)		(1,087)		(1,095)	0
Net loss							(3,612)	(3,612)
Ending, Shares at Mar. 31, 2019	37,467	239,400	99,266,918	(6,704)
Ending, Amount at Mar. 31, 2019	$ 0	$ 2	$ 992	$ (64)	185,300	(1,413)	(191,355)	(6,538)
Beginning, Shares at Dec. 31, 2018	37,467	239,400	98,230,336	(6,704)
Beginning, Amount at Dec. 31, 2018	$ 0	$ 2	$ 981	$ (64)	184,130	(1,428)	(186,648)	(3,027)
Accretion of Series A Preferred Stock discount								(370)
Issuance of common stock net of financing costs, Shares			5,954,545
Stock-based compensation expense								347
Net loss								(6,160)
Ending, Shares at Jun. 30, 2019	37,467	239,400	106,552,389	(6,704)
Ending, Amount at Jun. 30, 2019	$ 0	$ 2	$ 1,065	$ (64)	192,565	(1,433)	(195,107)	(2,972)
Beginning, Shares at Mar. 31, 2019	37,467	239,400	99,266,918	(6,704)
Beginning, Amount at Mar. 31, 2019	$ 0	$ 2	$ 992	$ (64)	185,300	(1,413)	(191,355)	(6,538)
Accretion of Series A Preferred Stock discount					(184)			(184)
Issuance of common stock net of financing costs, Shares			5,954,545
Issuance of common stock net of financing costs, Amount			$ 60		6,035			6,095
Issuance of common stock pursuant to option exercises, Shares			64,500
Issuance of common stock pursuant to option exercises, Amount			$ 1		59			60
Stock-based compensation expense					181			181
Issuance of common stock warrants as compensation					8			8
Foreign currency translation adjustment						(20)		(20)
Dividends on preferred stock, Shares			1,266,426
Dividends on preferred stock, Amount			$ (12)		(1,166)		(1,204)	(26)
Net loss							(2,548)	(2,548)
Ending, Shares at Jun. 30, 2019	37,467	239,400	106,552,389	(6,704)
Ending, Amount at Jun. 30, 2019	$ 0	$ 2	$ 1,065	$ (64)	$ 192,565	$ (1,433)	$ (195,107)	$ (2,972)