CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) [Abstract]
Revenues, net	$ 7,480	$ 7,729	$ 22,688	$ 21,856
Cost of revenues	2,855	3,099	8,544	9,992
Gross profit	4,625	4,630	14,144	11,864
Operating expenses:
Engineering and product development	249	224	788	831
Selling and marketing	2,887	2,487	8,911	7,737
General and administrative	2,218	2,289	7,398	6,583
Total operating expenses	5,354	5,000	17,097	15,151
Loss from operations	(729)	(370)	(2,953)	(3,287)
Other expense, net:
Interest expense, net	(153)	(239)	(433)	(930)
Change in fair value of warrant liability (see Note 1)	0	(79)	0	(101)
Total other expense, net	(153)	(318)	(433)	(1,031)
Loss before income taxes	(882)	(688)	(3,386)	(4,318)
Income tax benefit (expense)	22	80	111	0
Net loss	(860)	(608)	(3,275)	(4,318)
Loss attributable to common shares	(840)	(539)	(3,079)	(2,784)
Loss attributable to Preferred Series C shares	$ (20)	$ (69)	$ (196)	$ (1,534)
Loss per common share:
Basic (in dollars per share)	$ (0.03)	$ (0.02)	$ (0.10)	$ (0.17)
Diluted (in dollars per share)	$ (0.03)	$ (0.02)	$ (0.10)	$ (0.17)
Shares used in computing loss per common share:
Basic (in shares)	32,903,287	29,912,827	31,663,355	16,099,752
Diluted (in shares)	32,903,287	29,912,827	31,663,355	16,099,752
Loss per Preferred Series C share basic and diluted (in dollars per share)	$ (9.58)	$ (6.82)	$ (36.14)	$ (64.27)
Shares used in computing loss per basic and diluted Preferred Series C Shares (in shares)	2,103	10,049	5,412	23,872