Condensed Consolidated Statements of Operations and Comprehensive Income (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Statement [Abstract]
Net sales	$ 32,175,797	$ 28,222,443	$ 62,609,449	$ 53,863,835
Cost of products sold and services delivered	12,433,434	11,720,070	24,416,082	22,120,203
Gross margin	19,742,363	16,502,373	38,193,367	31,743,632
Sales, general and administrative expenses	10,940,085	8,404,611	22,122,025	17,258,633
Research and development expenses	1,992,064	2,038,830	4,004,620	4,171,050
Litigation judgment recovery				(2,200,000)
Income from operations	6,810,214	6,058,932	12,066,722	12,513,949
Interest and other income (expense), net	18,677	7,133	(4,084)	14,127
Income before provision for income taxes	6,828,891	6,066,065	12,062,638	12,528,076
Provision for income taxes	2,371,357	2,623,818	4,307,283	5,282,011
Net income	4,457,534	3,442,247	7,755,355	7,246,065
Income per common and common equivalent shares
Basic	$ 0.09	$ 0.06	$ 0.15	$ 0.12
Diluted	$ 0.08	$ 0.06	$ 0.14	$ 0.12
Weighted average number of common and common equivalent shares outstanding
Basic	51,109,060	54,520,889	51,923,097	58,849,010
Diluted	52,853,166	55,166,644	53,698,787	59,482,674
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	4,457,534	3,442,247	7,755,355	7,246,065
Foreign currency translation adjustments	(45,185)	(20,429)	(63,421)	(20,547)
Comprehensive income	$ 4,412,349	$ 3,421,818	$ 7,691,934	$ 7,225,518