Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue:
Service	$ 12,667	$ 12,517	$ 11,727
Subscription	5,808	6,377	6,203
License	3,318	3,295	7,728
Total revenue	21,793	22,189	25,658
Cost of revenue:
Service	5,673	5,488	5,077
Subscription	2,410	3,113	3,020
License	414	346	334
Total cost of revenue	8,497	8,947	8,431
Gross profit	13,296	13,242	17,227
Operating expenses:
Sales and marketing	11,888	9,275	7,974
Research, development and engineering	13,394	12,465	13,711
General and administrative	8,298	7,954	8,972
Intellectual property	1,636	1,525	1,793
Total operating expenses	35,216	31,219	32,450
Operating loss	(21,920)	(17,977)	(15,223)
Other income, net	258	109	55
Loss before income taxes	(21,662)	(17,868)	(15,168)
Provision for income taxes	(10)	(66)	(652)
Net loss	$ (21,672)	$ (17,934)	$ (15,820)
Earnings (loss) per common share:
Loss per common share—basic	$ (2.36)	$ (2.19)	$ (2.22)
Loss per common share—diluted	$ (2.36)	$ (2.19)	$ (2.22)
Weighted average common shares outstanding—basic	9,188	8,198	7,187
Weighted average common shares outstanding—diluted	9,188	8,198	7,187
Cash dividends declared per common share			$ 0.22