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Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Income Statement [Abstract]        
Net revenues $ 7,885,048 $ 9,729,047 $ 25,481,563 $ 27,572,459
Costs and expenses:        
Cost of products sold 980,176 1,339,723 3,379,018 3,692,256
Selling and marketing 3,608,828 3,821,953 10,645,229 11,365,966
Research and development 757,442 934,783 3,444,524 2,622,310
General and administrative 1,794,279 2,158,057 5,591,982 6,195,523
Amortization 473,439 485,493 1,471,879 1,083,706
Total costs and expenses 7,614,164 8,740,009 24,532,632 24,959,761
Operating income 270,884 989,038 948,931 2,612,698
Interest income 64,072 108,005 178,320 204,892
Interest expense (19,815) (26,877) (53,854) (51,358)
Income before income taxes 315,141 1,070,166 1,073,397 2,766,232
Income tax expense (193,439) (340,982) (530,885) (1,052,330)
Net income 121,702 729,184 542,512 1,713,902
Net loss at subsidiary attributable to noncontrolling interests 4,911 16,736 37,780 40,908
Net income attributable to common shareholders $ 126,613 $ 745,920 $ 580,292 $ 1,754,810
Earnings per share attributable to common shareholders        
- basic (in USD per share) $ 0.01 $ 0.04 $ 0.03 $ 0.10
- diluted (in USD per share) $ 0.01 $ 0.04 $ 0.03 $ 0.10
Weighted-average shares outstanding        
- basic (in shares) 16,604,682 17,544,905 16,811,360 17,730,715
- diluted (in shares) 16,996,376 17,848,110 17,193,854 17,990,561
Comprehensive income attributable to common shareholders $ 126,613 $ 745,920 $ 580,292 $ 1,754,810
Net loss at subsidiary attributable to noncontrolling interests 4,911 16,736 37,780 40,908
Total comprehensive income $ 121,702 $ 729,184 $ 542,512 $ 1,713,902