CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Sales	$ 98,244	$ 82,682	$ 191,078	$ 164,244
Cost of Sales	40,553	35,922	79,601	73,735
Gross Profit	57,691	46,760	111,477	90,509
Operating Expenses
Selling and marketing	30,084	26,022	58,355	48,894
General and administrative	11,320	11,877	22,393	22,576
Depreciation and amortization	4,377	3,989	8,720	7,707
Research and development	9,983	9,045	19,389	17,511
Total operating expenses	55,764	50,933	108,857	96,688
Income (loss) from operations	1,927	(4,173)	2,620	(6,179)
Other expense (income)
Interest income, net	(87)	(89)	(160)	(171)
Other expense, net	509	459	693	467
Income (loss) before income tax expense (benefit)	1,505	(4,543)	2,087	(6,475)
Income tax expense (benefit)	300	(918)	427	(1,389)
Net income (loss)	$ 1,205	$ (3,625)	$ 1,660	$ (5,086)
Net income (loss) per share - Basic (in dollars per share)	$ 0.07	$ (0.22)	$ 0.10	$ (0.30)
Net income (loss) per share - Diluted (in dollars per share)	$ 0.07	$ (0.22)	$ 0.10	$ (0.30)
Weighted average shares - Basic (in shares)	16,966,928	16,700,718	16,902,390	16,692,500
Weighted average shares - Diluted (in shares)	17,264,642	16,700,718	17,210,054	16,692,500
Product
Sales	$ 75,720	$ 62,533	$ 146,301	$ 124,913
Cost of Sales	27,878	24,455	54,762	51,513
Service
Sales	22,524	20,149	44,777	39,331
Cost of Sales	$ 12,675	$ 11,467	$ 24,839	$ 22,222