Condensed Consolidated Statements of Operations and Comprehensive Income (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Statement [Abstract]
Net sales	$ 35,196,822	$ 28,772,956	$ 97,806,271	$ 82,636,791
Cost of products sold and services delivered	13,100,817	11,969,944	37,516,899	34,090,148
Gross margin	22,096,005	16,803,012	60,289,372	48,546,643
Sales, general and administrative expenses	12,775,980	9,539,996	34,898,005	26,798,629
Research and development expenses	2,439,812	1,985,701	6,444,432	6,156,751
Litigation judgment recovery				(2,200,000)
Income from operations	6,880,213	5,277,315	18,946,935	17,791,263
Interest and other income (expense), net	34,891	11,418	30,807	25,545
Income before provision for income taxes	6,915,104	5,288,733	18,977,742	17,816,808
Provision for income taxes	1,801,512	1,611,861	6,108,795	6,893,872
Net income	5,113,592	3,676,872	12,868,947	10,922,936
Income per common and common equivalent shares
Basic	$ 0.10	$ 0.07	$ 0.25	$ 0.19
Diluted	$ 0.10	$ 0.07	$ 0.24	$ 0.19
Weighted average number of common and common equivalent shares outstanding
Basic	51,341,785	52,509,068	51,727,197	57,997,341
Diluted	53,320,918	53,106,325	53,643,803	58,482,833
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	5,113,592	3,676,872	12,868,947	10,922,936
Foreign currency translation adjustments	92,306	25,863	28,885	5,316
Comprehensive income	$ 5,205,898	$ 3,702,735	$ 12,897,832	$ 10,928,252