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Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Income Statement [Abstract]    
Net revenues $ 8,093,244 $ 10,258,132
Costs and expenses:    
Cost of products sold 1,053,717 1,108,635
Selling and marketing 3,613,931 3,673,939
Research and development 826,373 1,448,718
General and administrative 1,897,217 2,575,739
Amortization 293,955 125,050
Total costs and expenses 7,685,193 8,932,081
Operating income 408,051 1,326,051
Interest income 67,343 92,377
Interest expense (12,203) (17,735)
Income before income taxes 463,191 1,400,693
Income tax expense (188,009) (559,367)
Net income 275,182 841,326
Net loss at subsidiary attributable to noncontrolling interests 11,138 13,383
Net income attributable to common shareholders 286,320 854,709
Earnings per share attributable to common shareholders    
- basic (in USD per share) $ 0.02 $ 0.05
- diluted (in USD per share) $ 0.02 $ 0.05
Weighted-average shares outstanding    
- basic (in shares) 17,907,848 18,758,383
- diluted (in shares) 18,161,680 18,925,165
Comprehensive income $ 275,182 $ 841,326