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Statements of Operations (Unaudited) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Revenue:        
Product revenue, net $ 2,702,682 $ 2,835,357 $ 5,032,975 $ 5,541,790
Other revenue 80,111 87,851 159,156 167,104
Net revenue 2,782,793 2,923,208 5,192,131 5,708,894
Operating expense:        
Cost of revenue 1,932,368 1,943,429 3,778,019 3,805,088
Gross profit 850,425 979,779 1,414,112 1,903,806
Research and development expense 414,051 459,996 813,665 861,021
Selling, general and administrative expense 812,850 1,049,892 1,757,165 2,127,589
Loss from operations (376,476) (530,109) (1,156,718) (1,084,804)
Interest income   1,444   3,338
Interest expense (1,932) (900) (3,037) (1,798)
Other, net (26)   7,199 (43)
Loss before provision for income taxes (378,434) (529,565) (1,152,556) (1,083,307)
Provisions for income taxes            
Net loss $ (378,434) $ (529,565) $ (1,152,556) $ (1,083,307)
Net loss per share - basic and diluted $ (0.02) $ (0.02) $ (0.05) $ (0.05)
Weighted average number of basic and diluted common shares outstanding 21,208,162 21,204,162 21,208,162 21,204,162