Condensed Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Income Statement [Abstract]
NET SALES	$ 51,270	$ 47,278	$ 165,083	$ 152,329
COST OF GOODS SOLD	15,392	14,898	50,688	48,156
Gross profit	35,878	32,380	114,395	104,173
OPERATING EXPENSES:
Sales and marketing	18,713	18,041	60,501	57,292
General and administrative	4,564	5,070	14,947	16,555
Research and development	4,366	3,502	12,630	9,717
Depreciation and amortization	3,722	3,663	11,327	10,642
Total operating expenses	31,365	30,276	99,405	94,206
INCOME FROM OPERATIONS	4,513	2,104	14,990	9,967
OTHER INCOME (EXPENSE):
Interest income	0	0	8	3
Other (expense) income	22	30	57	73
Interest expense	(322)	(281)	(1,156)	(821)
Foreign currency gain (loss), net	60	(48)	194	845
Total other income (expense)	(240)	(299)	(897)	100
INCOME BEFORE INCOME TAXES	4,273	1,805	14,093	10,067
PROVISION FOR INCOME TAXES	1,720	494	5,232	3,063
NET INCOME	$ 2,553	$ 1,311	$ 8,861	$ 7,004
BASIC EARNINGS PER SHARE (in dollars per share)	$ 0.19	$ 0.10	$ 0.67	$ 0.54
DILUTED EARNINGS PER SHARE (in dollars per share)	$ 0.19	$ 0.10	$ 0.67	$ 0.53