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Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Income Statement [Abstract]    
Net revenues $ 7,737,532 $ 8,686,774
Costs and expenses:    
Cost of products sold 1,223,939 1,161,841
Selling and marketing 3,698,962 3,530,915
Research and development 706,472 1,859,012
General and administrative 2,077,972 1,644,141
Amortization 530,770 486,749
Total costs and expenses 8,238,115 8,682,658
Operating income (loss) (500,583) 4,116
Interest income 77,129 56,402
Interest expense (20,442) (15,550)
Income (loss) before income taxes (443,896) 44,968
Income tax (expense) benefit 175,339 (18,456)
Net income (loss) (268,557) 26,512
Net loss at subsidiary attributable to noncontrolling interests 15,446 19,769
Net income (loss) attributable to common shareholders $ (253,111) $ 46,281
Earnings (loss) per share attributable to common shareholders    
- basic (in USD per share) $ (0.02) $ 0.00
- diluted (in USD per share) $ (0.02) $ 0.00
Weighted-average shares outstanding    
- basic (in shares) 16,341,481 17,012,852
- diluted (in shares) 16,341,481 17,405,019
Comprehensive income (loss) attributable to common shareholders $ (253,111) $ 46,281
Net loss at subsidiary attributable to noncontrolling interests 15,446 19,769
Total comprehensive income (loss) $ (268,557) $ 26,512