Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue:
Total revenue	$ 6,497	$ 6,180	$ 12,686	$ 11,840
Cost of revenue:
Total cost of revenue	2,113	2,185	4,311	4,319
Gross profit	4,384	3,995	8,375	7,521
Operating expenses:
Sales and marketing	4,633	5,087	9,879	10,037
Research, development and engineering	4,208	3,981	8,641	8,019
General and administrative	3,081	3,079	6,448	6,289
Total operating expenses	11,922	12,147	24,968	24,345
Operating loss	(7,538)	(8,152)	(16,593)	(16,824)
Other income, net	79	231	221	468
Loss before income taxes	(7,459)	(7,921)	(16,372)	(16,356)
Benefit (provision) for income taxes	(2)	(12)	3	(40)
Net loss	$ (7,461)	$ (7,933)	$ (16,369)	$ (16,396)
Earnings (loss) per common share:
Loss per common share — basic	$ (0.62)	$ (0.68)	$ (1.36)	$ (1.42)
Loss per common share — diluted	$ (0.62)	$ (0.68)	$ (1.36)	$ (1.42)
Weighted average common shares outstanding — basic	12,108	11,665	12,073	11,576
Weighted average common shares outstanding — diluted	12,108	11,665	12,073	11,576
Service [Member]
Revenue:
Total revenue	$ 3,892	$ 3,575	$ 7,630	$ 7,389
Cost of revenue:
Total cost of revenue	1,601	1,676	3,285	3,321
Subscription [Member]
Revenue:
Total revenue	2,605	2,605	5,056	4,451
Cost of revenue:
Total cost of revenue	$ 512	$ 509	$ 1,026	$ 998