Consolidated Statements of Comprehensive Loss (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Consolidated Statements of Comprehensive Loss [Abstract]
Net Sales	$ 19,498,652	$ 19,787,034
Cost of sales	11,963,526	12,874,709
Gross Profit	7,535,126	6,912,325
Operating Expenses
Selling, general and administrative	13,296,635	13,049,555
Research and development	4,472,229	4,183,599
Total operating expenses	17,768,864	17,233,154
Operating loss	(10,233,738)	(10,320,829)
Other expense (income), net:	367,788	(39,251)
Loss before income taxes	(10,601,526)	(10,281,578)
Income tax provision (benefit)	8,051	(11,563)
Net Loss	(10,609,577)	(10,270,015)
Other Comprehensive Loss
Foreign currency translation adjustment	(155,811)	(202,612)
Unrealized gain (loss) on equity securities, net of taxes	8,805	(376,675)
Total other comprehensive loss	(147,006)	(579,287)
Comprehensive Loss	$ (10,756,583)	$ (10,849,302)
Net loss per common share - basic and diluted	$ (0.42)	$ (0.46)
Shares used in computing net loss per common share - basic and diluted	25,552,762	22,564,611