CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 26, 2015	Sep. 30, 2016	Sep. 26, 2015
SALES
Product	$ 61,280	$ 57,803	$ 182,232	$ 182,284
Service	18,320	14,704	51,654	43,937
Total sales	79,600	72,507	233,886	226,221
COST OF SALES
Product	25,870	28,943	74,933	80,652
Service	11,051	8,693	29,665	26,541
Total cost of sales (exclusive of depreciation and amortization, shown separately below)	36,921	37,636	104,598	107,193
GROSS PROFIT	42,679	34,871	129,288	119,028
OPERATING EXPENSES:
Selling and marketing	19,729	18,944	56,101	58,112
General and administrative	10,775	8,239	31,483	27,106
Depreciation and amortization	3,381	2,790	9,733	8,022
Research and development	7,953	5,820	22,303	19,430
Total operating expenses	41,838	35,793	119,620	112,670
INCOME (LOSS) FROM OPERATIONS	841	(922)	9,668	6,358
OTHER (INCOME) EXPENSE
Interest (income) expense, net	(21)	7	(119)	(36)
Other (income) expense, net	(167)	131	824	1,521
INCOME (LOSS) BEFORE INCOME TAX (BENEFIT) EXPENSE	1,029	(1,060)	8,963	4,873
INCOME TAX (BENEFIT) EXPENSE	(61)	(176)	1,401	945
NET INCOME (LOSS)	$ 1,090	$ (884)	$ 7,562	$ 3,928
NET INCOME (LOSS) PER SHARE - BASIC (in dollars per share)	$ 0.07	$ (0.05)	$ 0.45	$ 0.23
NET INCOME (LOSS) PER SHARE - DILUTED (in dollars per share)	$ 0.07	$ (0.05)	$ 0.45	$ 0.22
Weighted average shares - Basic (in shares)	16,674,176	17,395,824	16,647,662	17,372,562
Weighted average shares - Diluted (in shares)	16,701,617	17,395,824	16,669,550	17,496,190