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Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Income Statement [Abstract]    
Net revenues $ 8,587,605 $ 9,636,755
Costs and expenses:    
Cost of products sold 1,527,961 1,381,497
Selling and marketing 4,670,511 5,293,020
Research and development 1,874,939 898,363
General and administrative 2,330,281 2,110,233
Amortization 636,135 611,444
Total costs and expenses 11,039,827 10,294,557
Operating income (loss) (2,452,222) (657,802)
Interest income 82,494 52,535
Interest expense (18,302) (31,715)
Income (loss) before income taxes (2,388,030) (636,982)
Income tax (expense) benefit 4,159 656,587
Net income (loss) (2,392,189) (1,293,569)
Net loss at subsidiary attributable to noncontrolling interests (12,950) (19,123)
Net income (loss) attributable to common shareholders $ (2,379,239) $ (1,274,446)
Earnings (loss) per share attributable to common shareholders    
- basic (in dollars per share) $ (0.15) $ (0.08)
- diluted (in dollars per share) $ (0.15) $ (0.08)
Weighted-average shares outstanding    
- basic (in shares) 15,689,240 16,042,219
- diluted (in shares) 15,689,240 16,042,219
Comprehensive income (loss) attributable to common shareholders $ (2,379,239) $ (1,274,446)
Net loss at subsidiary attributable to noncontrolling interests 12,950 19,123
Total comprehensive income (loss) $ (2,392,189) $ (1,293,569)