Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Sales:
Product	$ 16,367	$ 14,169	$ 46,521	$ 43,355
Service	27,150	26,281	80,489	77,755
Net sales	43,517	40,450	127,010	121,110
Costs and expenses:
Costs of product sales	9,767	9,578	28,784	29,412
Costs of service sales	15,376	13,374	44,690	39,736
Research and development	3,789	3,990	11,288	11,698
Sales, marketing and support	8,421	8,234	25,856	25,098
General and administrative	7,084	7,075	21,679	22,805
Total costs and expenses	44,437	42,251	132,297	128,749
Loss from operations	(920)	(1,801)	(5,287)	(7,639)
Interest income	161	166	464	491
Interest expense	453	379	1,290	1,081
Other income (expense), net	199	(141)	371	(321)
Loss before income tax expense	(1,013)	(2,155)	(5,742)	(8,550)
Income tax expense	161	283	668	799
Net loss	$ (1,174)	$ (2,438)	$ (6,410)	$ (9,349)
Net loss per common share
Earnings Per Share, Basic and Diluted	$ (0.07)	$ (0.15)	$ (0.38)	$ (0.57)
Weighted average number of common shares outstanding:
Weighted Average Number of Shares Outstanding, Basic and Diluted		16,469	17,025	16,393
Diluted	17,188	16,469	17,025	16,393