CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Sales
Product	$ 68,563	$ 61,280	$ 193,476	$ 182,232
Service	21,687	18,320	61,018	51,654
Total sales	90,250	79,600	254,494	233,886
Cost of Sales
Product	26,673	25,880	78,186	74,938
Service	11,543	11,042	33,765	29,665
Total cost of sales (exclusive of depreciation and amortization, shown separately below)	38,216	36,922	111,951	104,603
Gross Profit	52,034	42,678	142,543	129,283
Operating Expenses:
Selling and marketing	25,990	19,781	74,884	56,399
General and administrative	10,307	10,747	32,883	31,139
Depreciation and amortization	4,368	3,381	12,075	9,733
Research and development	9,019	7,928	26,530	22,344
Total operating expenses	49,684	41,837	146,372	119,615
Income (loss) from operations	2,350	841	(3,829)	9,668
Other (income) expense
Interest income, net	(78)	(21)	(249)	(119)
Other (income) expense, net	(147)	(167)	320	824
Income (loss) before income tax expense (benefit)	2,575	1,029	(3,900)	8,963
Income tax expense (benefit)	947	(61)	(442)	1,401
Net income (loss)	$ 1,628	$ 1,090	$ (3,458)	$ 7,562
Net income (loss) per share - Basic (in dollars per share)	$ 0.10	$ 0.07	$ (0.21)	$ 0.45
Net income (loss) per share - Diluted (in dollars per share)	$ 0.10	$ 0.07	$ (0.21)	$ 0.45
Weighted average shares - Basic	16,708,446	16,674,176	16,697,729	16,647,662
Weighted average shares - Diluted	16,796,518	16,701,617	16,697,729	16,669,550