CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Sales	$ 90,516	$ 99,705	$ 277,624	$ 290,783
Cost of Sales	39,744	49,093	123,093	132,071
Gross Profit	50,772	50,612	154,531	158,712
Operating Expenses
Selling and marketing	30,218	28,482	87,438	87,877
General and administrative	15,662	13,102	44,471	36,789
Depreciation and amortization			14,203	13,467
Research and development	10,783	11,740	33,048	34,138
Total operating expenses	56,663	53,324	164,957	158,804
Loss from operations	(5,891)	(2,712)	(10,426)	(92)
Other (income) expense
Interest (income) expense, net	(24)	(96)	72	(205)
Other expense, net	514	226	2,398	868
Loss before income tax (benefit) expense	(6,381)	(2,842)	(12,896)	(755)
Income tax (benefit) expense	(182)	(354)	(444)	73
Net loss	$ (6,199)	$ (2,488)	$ (12,452)	$ (828)
Net (loss) income per share - Basic (in dollars per share)	$ (0.36)	$ (0.15)	$ (0.72)	$ (0.05)
Net (loss) income per share - Diluted (in dollars per share)	$ (0.36)	$ (0.15)	$ (0.72)	$ (0.05)
Weighted average shares - Basic (in shares)	17,367,228	17,122,705	17,352,386	16,976,459
Weighted average shares - Diluted (in shares)	17,367,228	17,122,705	17,352,386	16,976,459
Product
Sales	$ 63,641	$ 75,817	$ 200,434	$ 222,118
Cost of Sales	26,495	34,864	83,632	91,321
Service
Sales	26,875	23,888	77,190	68,665
Cost of Sales	$ 13,249	$ 14,229	$ 39,461	$ 40,750