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Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Net revenues $ 10,258,132 $ 10,256,212
Costs and expenses:    
Cost of products sold 1,108,635 848,550
Selling and marketing 3,673,939 4,980,553
Research and development 1,448,718 1,404,022
General and administrative 2,575,739 2,265,025
Amortization 125,050 112,047
Total costs and expenses 8,932,081 9,610,197
Operating income 1,326,051 646,015
Interest income 92,377 72,281
Interest expense (17,735) (22,427)
Income before income taxes 1,400,693 695,869
Income tax expense (559,367) (282,028)
Net income 841,326 413,841
Net loss at subsidiary attributable to noncontrolling interests 13,383 9,367
Net income attributable to common shareholders 854,709 423,208
Earnings per share attributable to common shareholders    
- basic (in USD per share) $ 0.05 $ 0.02
- diluted (in USD per share) $ 0.05 $ 0.02
Weighted-average shares outstanding    
- basic (in shares) 18,758,383 20,007,998
- diluted (in shares) 18,925,165 20,234,438
Comprehensive income $ 841,326 $ 413,841