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Statements of Operations (Unaudited) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Revenue:    
Product revenue $ 2,975,721 $ 2,330,293
Other revenue 3,632 79,045
Total revenue 2,979,353 2,409,338
Operating expense:    
Cost of revenue 2,073,098 1,845,651
Gross profit 906,255 563,687
Research and development expenses 428,730 399,614
Selling, general and administrative expenses 960,668 944,315
Loss from operations (483,143) (780,242)
Interest income 317  
Interest expense (7,354) (1,105)
Other, net 6,000 7,225
Loss before provision for income taxes (484,180) (774,122)
Provision for income taxes      
Net loss $ (484,180) $ (774,122)
Net loss per share-basic and diluted $ (0.02) $ (0.04)
Weighted average number of basic and diluted common shares outstanding 28,466,717 21,208,162