Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Condensed Consolidated Statements of Operations and Comprehensive Income [Abstract]
Net sales	$ 25,641,392	$ 23,116,949
Cost of products sold	10,400,133	10,908,086
Gross margin	15,241,259	12,208,863
Sales, general and administrative expenses	8,854,022	9,346,213
Research and development expenses	2,132,220	2,752,465
Litigation judgment expense	(2,200,000)
Income from operations	6,455,017	110,185
Interest and other income, net	6,994	26,322
Income before provision for income taxes	6,462,011	136,507
Provision for income taxes	2,658,193	116,775
Income per common and common equivalent shares
Basic	$ 0.07	$ 0
Diluted	$ 0.07	$ 0
Weighted average number of common and common equivalent shares outstanding
Basic	55,700,395	62,409,267
Diluted	56,358,066	63,250,334
Net income	3,803,818	19,732
Foreign currency translation adjustments	(118)	20,148
Comprehensive income	$ 3,803,700	$ 39,880