Consolidated Statements of Operations and Comprehensive Income (Loss) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Consolidated Statements of Operations and Comprehensive Income (Loss) [Abstract]
Net sales	$ 90,027,906	$ 86,930,019	$ 104,251,560
Cost of products sold	41,752,520	41,563,144	40,849,151
Excess inventory charges	3,746,149
Gross margin	44,529,237	45,366,875	63,402,409
Operating expenses:
Sales, general and administrative	38,000,455	39,021,564	43,479,232
Research and development	9,989,219	11,411,889	20,002,351
Litigation judgment	3,301,243
Loss on impairment	1,353,857
Loss on write down / disposal of property and equipment, net	2,800,396	73,061
Total operating expenses	55,445,170	50,506,514	63,481,583
Loss from operations	(10,915,933)	(5,139,639)	(79,174)
Interest and other income, net	1,287,192	25,819	170,547
(Loss) income before (benefit) provision for income taxes	(9,628,741)	(5,113,820)	91,373
(Benefit) provision for income taxes	(2,588,875)	(729,385)	92,479
Net loss	(7,039,866)	(4,384,435)	(1,106)
Net loss per common and common equivalent shares:
Basic	$ (0.12)	$ (0.07)	$ 0.00
Diluted	$ (0.12)	$ (0.07)	$ 0.00
Weighted average number of common and common equivalent shares outstanding:
Basic	59,435,624	62,524,446	61,920,094
Diluted	59,435,624	62,524,446	61,920,094
Net loss	(7,039,866)	(4,384,435)	(1,106)
Foreign currency translation adjustments	(45,511)	(35,445)
Comprehensive loss	$ (7,085,377)	$ (4,419,880)	$ (1,106)