Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenue:
Service	$ 3,148	$ 3,235	$ 6,398	$ 6,736
Subscription	1,494	1,670	2,957	3,386
License	815	893	1,682	1,665
Total revenue	5,457	5,798	11,037	11,787
Cost of revenue:
Service	1,401	1,497	2,833	3,075
Subscription	594	866	1,256	1,620
License	99	86	195	170
Total cost of revenue	2,094	2,449	4,284	4,865
Gross profit	3,363	3,349	6,753	6,922
Operating expenses:
Sales and marketing	2,856	2,098	5,811	4,188
Research, development and engineering	3,379	3,025	6,684	6,109
General and administrative	1,976	1,980	4,146	4,186
Intellectual property	462	291	896	658
Total operating expenses	8,673	7,394	17,537	15,141
Operating loss	(5,310)	(4,045)	(10,784)	(8,219)
Other income, net	42	32	88	55
Loss before income taxes	(5,268)	(4,013)	(10,696)	(8,164)
(Provision) benefit for income taxes	(15)	1	(22)	2
Net loss	$ (5,283)	$ (4,012)	$ (10,718)	$ (8,162)
Earnings (loss) per common share:
Loss per common share—basic	$ (0.62)	$ (0.50)	$ (1.25)	$ (1.02)
Loss per common share—diluted	$ (0.62)	$ (0.50)	$ (1.25)	$ (1.02)
Weighted average common shares outstanding—basic	8,587	8,029	8,560	7,995
Weighted average common shares outstanding—diluted	8,587	8,029	8,560	7,995