CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Sales
Product	$ 62,533	$ 61,640	$ 124,913	$ 120,952
Service	20,149	16,898	39,331	33,334
Total sales	82,682	78,538	164,244	154,286
Cost of Sales
Product	24,455	25,062	51,513	49,058
Service	11,467	9,542	22,222	18,623
Total cost of sales (exclusive of depreciation and amortization, shown separately below)	35,922	34,604	73,735	67,681
Gross Profit	46,760	43,934	90,509	86,605
Operating Expenses:
Selling and marketing	26,022	18,715	48,894	36,618
General and administrative	11,877	10,242	22,576	20,392
Depreciation and amortization	3,989	3,266	7,707	6,352
Research and development	9,045	7,214	17,511	14,416
Total operating expenses	50,933	39,437	96,688	77,778
(Loss) income from operations	(4,173)	4,497	(6,179)	8,827
Other (income) expense
Interest income, net	(89)	(54)	(171)	(98)
Other expense, net	459	240	467	991
(Loss) income before income tax (benefit) expense	(4,543)	4,311	(6,475)	7,934
Income tax (benefit) expense	(918)	919	(1,389)	1,462
Net (loss) income	$ (3,625)	$ 3,392	$ (5,086)	$ 6,472
Net (loss) income per share - Basic (in dollars per share)	$ (0.22)	$ 0.20	$ (0.30)	$ 0.39
Net (loss) income per share - Diluted (in dollars per share)	$ (0.22)	$ 0.20	$ (0.30)	$ 0.39
Weighted average shares - Basic (in shares)	16,700,718	16,659,115	16,692,500	16,634,323
Weighted average shares - Diluted (in shares)	16,700,718	16,672,600	16,692,500	16,654,415