Condensed Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
NET SALES	$ 59,919	$ 56,237	$ 191,341	$ 179,106
COST OF GOODS SOLD	18,772	16,597	59,408	54,573
Gross profit	41,147	39,640	131,933	124,533
OPERATING EXPENSES:
Sales and marketing	21,684	20,587	68,838	63,901
General and administrative	5,186	5,180	16,740	16,803
Research and development	5,096	5,258	15,495	14,389
Depreciation and amortization	4,592	4,073	13,326	12,697
Total operating expenses	36,558	35,098	114,399	107,790
INCOME FROM OPERATIONS	4,589	4,542	17,534	16,743
OTHER INCOME (EXPENSE):
Interest income	29	3	35	7
Other income	43	26	115	91
Interest expense	(186)	(283)	(716)	(860)
Foreign currency gain (loss), net	73	(103)	665	(862)
Total other income (expense)	(41)	(357)	99	(1,624)
INCOME BEFORE INCOME TAXES	4,548	4,185	17,633	15,119
PROVISION FOR INCOME TAXES	1,383	1,307	5,680	4,468
NET INCOME	$ 3,165	$ 2,878	$ 11,953	$ 10,651
BASIC EARNINGS PER SHARE	$ 0.22	$ 0.20	$ 0.85	$ 0.76
DILUTED EARNINGS PER SHARE	$ 0.22	$ 0.20	$ 0.84	$ 0.75