CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
SALES
Product	$ 69,437	$ 67,382	$ 124,481	$ 127,204
Service	14,338	14,678	29,233	28,230
Total sales	83,775	82,060	153,714	155,434
COST OF SALES
Product	29,532	26,392	51,709	51,545
Service	9,697	10,151	17,848	18,289
Total cost of sales (exclusive of depreciation and amortization, shown separately below)	39,229	36,543	69,557	69,834
GROSS PROFIT	44,546	45,517	84,157	85,600
OPERATING EXPENSES:
Selling and marketing	20,063	19,715	39,168	37,148
General and administrative	9,066	8,867	18,867	17,280
Depreciation and amortization	2,739	1,868	5,232	3,715
Research and development	7,254	6,658	13,610	12,088
Total operating expenses	39,122	37,108	76,877	70,231
INCOME FROM OPERATIONS	5,424	8,409	7,280	15,369
OTHER (INCOME) EXPENSE
Interest income, net	(24)	(21)	(43)	(38)
Other expense (income), net	83	(149)	1,390	11
INCOME BEFORE INCOME TAX EXPENSE	5,365	8,579	5,933	15,396
INCOME TAX EXPENSE	1,217	2,251	1,121	4,092
NET INCOME	$ 4,148	$ 6,328	$ 4,812	$ 11,304
NET INCOME PER SHARE - BASIC	$ 0.24	$ 0.37	$ 0.28	$ 0.66
NET INCOME PER SHARE - DILUTED	$ 0.24	$ 0.36	$ 0.27	$ 0.65
Weighted average shares - Basic	17,384,382	17,233,012	17,360,749	17,220,146
Weighted average shares - Diluted	17,502,219	17,338,388	17,500,619	17,364,436