CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 27, 2015	Jun. 30, 2016	Jun. 27, 2015
SALES
Product	$ 61,640	$ 69,437	$ 120,952	$ 124,481
Service	16,898	14,338	33,334	29,233
Total sales	78,538	83,775	154,286	153,714
COST OF SALES
Product	25,055	29,532	49,063	51,709
Service	9,547	9,697	18,614	17,848
Total cost of sales (exclusive of depreciation and amortization, shown separately below)	34,602	39,229	67,677	69,557
GROSS PROFIT	43,936	44,546	86,609	84,157
OPERATING EXPENSES:
Selling and marketing	18,747	20,063	36,372	39,168
General and administrative	10,167	9,066	20,708	18,867
Depreciation and amortization	3,266	2,739	6,352	5,232
Research and development	7,259	7,254	14,350	13,610
Total operating expenses	39,439	39,122	77,782	76,877
INCOME FROM OPERATIONS	4,497	5,424	8,827	7,280
OTHER (INCOME) EXPENSE
Interest income, net	(54)	(24)	(98)	(43)
Other expense, net	240	83	991	1,390
INCOME BEFORE INCOME TAX EXPENSE	4,311	5,365	7,934	5,933
Income tax expense	919	1,217	1,462	1,121
NET INCOME	$ 3,392	$ 4,148	$ 6,472	$ 4,812
NET INCOME PER SHARE - BASIC	$ 0.20	$ 0.24	$ 0.39	$ 0.28
NET INCOME PER SHARE - DILUTED	$ 0.20	$ 0.24	$ 0.39	$ 0.27
Weighted average shares - Basic	16,659,115	17,384,382	16,634,323	17,360,749
Weighted average shares - Diluted	16,672,600	17,502,219	16,654,415	17,500,619