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Condensed Consolidated Statements Of Operations And Comprehensive Loss (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Condensed Consolidated Statements Of Operations And Comprehensive Loss [Abstract]    
Revenue $ 17,476,302 $ 15,637,081
Cost of revenue 4,724,500 3,744,277
Gross profit 12,751,802 11,892,804
Operating expenses:    
Research and development expenses 3,388,925 2,944,347
Selling, general and administrative expenses 10,858,863 10,022,652
Total operating expenses 14,247,788 12,966,999
Loss from operations (1,495,986) (1,074,195)
Other income (expense):    
Interest expense (224,259) (308,514)
Interest income 1,730 4,250
Other 101,294 109,914
Loss before income tax expense (1,617,221) (1,268,545)
Income tax expense 2,559 4,501
Net loss (1,619,780) (1,273,046)
Basic and diluted net loss per share $ (0.10) $ (0.08)
Weighted average shares outstanding - basic and diluted 16,015,877 15,396,307
Comprehensive loss $ (1,566,324) $ (1,257,472)