Consolidated Statements of Operations and Comprehensive Income (Loss) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Consolidated Statements of Operations and Comprehensive Income (Loss) [Abstract]
Net sales	$ 114,752,748	$ 90,027,906	$ 86,930,019
Cost of products sold and services delivered	47,038,173	41,752,520	41,563,144
Excess inventory charges	553,701	3,746,149	1,278,284
Gross margin	67,714,575	44,529,237	45,366,875
Operating expenses:
Sales, general and administrative	39,086,190	38,000,455	39,021,564
Research and development	8,139,359	9,989,219	11,411,889
Litigation judgment	(2,200,000)	3,301,243
Loss on impairment		1,353,857
Loss on write down / disposal of property and equipment, net	160,506	2,800,396	73,061
Total operating expenses	45,186,055	55,445,170	50,506,514
Income (loss) from operations	22,528,520	(10,915,933)	(5,139,639)
Interest and other income, net	82,842	1,287,192	25,819
Income (loss) before provision (benefit) for income taxes	22,611,362	(9,628,741)	(5,113,820)
Provision (benefit) for income taxes	7,873,620	(2,588,875)	(729,385)
Net income (loss)	14,737,742	(7,039,866)	(4,384,435)
Net income (loss) per common and common equivalent shares:
Basic	$ 0.27	$ (0.12)	$ (0.07)
Diluted	$ 0.27	$ (0.12)	$ (0.07)
Weighted average number of common and common equivalent shares outstanding:
Basic	53,827,204	59,435,624	62,524,446
Diluted	54,722,785	59,435,624	62,524,446
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)
Net income (loss)	14,737,742	(7,039,866)	(4,384,435)
Foreign currency translation adjustments	23,924	(45,511)	(35,445)
Comprehensive income (loss)	$ 14,761,666	$ (7,085,377)	$ (4,419,880)