CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Sales	$ 93,491	$ 98,244	$ 187,108	$ 191,078
Cost of Sales	41,172	40,553	79,770	79,601
Gross Profit	52,319	57,691	107,338	111,477
Operating Expenses
Selling and marketing	29,124	30,084	55,877	58,355
General and administrative	14,424	11,320	27,648	22,393
Depreciation and amortization	4,573	4,377	9,322	8,720
Research and development	9,091	9,983	19,026	19,389
Total operating expenses	57,212	55,764	111,873	108,857
(Loss) income from operations	(4,893)	1,927	(4,535)	2,620
Other expense (income)
Interest expense (income), net	240	(87)	96	(160)
Other expense, net	1,689	509	1,884	693
(Loss) income before income tax (benefit) expense	(6,822)	1,505	(6,515)	2,087
Income tax (benefit) expense	(417)	300	(262)	427
Net (loss) income	$ (6,405)	$ 1,205	$ (6,253)	$ 1,660
Net (loss) income per share - Basic (in dollars per share)	$ (0.37)	$ 0.07	$ (0.36)	$ 0.10
Net (loss) income per share - Diluted (in dollars per share)	$ (0.37)	$ 0.07	$ (0.36)	$ 0.10
Weighted average shares - Basic (in shares)	17,333,996	16,966,928	17,323,479	16,902,390
Weighted average shares - Diluted (in shares)	17,333,996	17,264,642	17,323,479	17,210,054
Product
Sales	$ 67,992	$ 75,720	$ 136,792	$ 146,301
Cost of Sales	29,037	27,878	55,165	54,762
Service
Sales	25,499	22,524	50,316	44,777
Cost of Sales	$ 12,135	$ 12,675	$ 24,605	$ 24,839