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Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Statement [Abstract]        
Net revenues $ 11,196,961 $ 8,791,753 $ 29,500,843 $ 23,944,120
Costs and expenses:        
Cost of products sold 2,166,353 1,973,948 5,216,776 4,353,148
Selling and marketing 6,226,438 3,614,714 16,174,391 10,585,955
Research and development 943,162 644,662 2,921,951 2,029,914
General and administrative 2,090,785 1,865,575 6,554,158 5,817,943
Amortization 609,572 562,722 1,811,589 1,632,920
Total costs and expenses 12,036,310 8,661,621 32,678,865 24,419,880
Operating income (loss) (839,349) 130,132 (3,178,022) (475,760)
Interest income 94,833 51,636 216,849 160,248
Interest expense (8,902) (29,088) (70,646) (77,777)
Income (loss) before income taxes (753,418) 152,680 (3,031,819) (393,289)
Income tax (expense) benefit (3,822) (57,192) (4,196,192) 159,282
Net income (loss) (757,240) 95,488 (7,228,011) (234,007)
Net loss at subsidiary attributable to noncontrolling interests 14,209 10,678 49,923 39,018
Net income (loss) attributable to common shareholders $ (743,031) $ 106,166 $ (7,178,088) $ (194,989)
Earnings (loss) per share attributable to common shareholders        
- basic (in dollars per share) $ (0.05) $ 0.01 $ (0.45) $ (0.01)
- diluted (in dollars per share) $ (0.05) $ 0.01 $ (0.45) $ (0.01)
Weighted-average shares outstanding        
- basic (in shares) 15,867,159 16,217,442 15,973,737 16,268,579
- diluted (in shares) 15,867,159 16,504,568 15,973,737 16,268,579
Comprehensive income (loss) attributable to common shareholders $ (743,031) $ 106,166 $ (7,178,088) $ (194,989)
Net loss at subsidiary attributable to noncontrolling interests 14,209 10,678 49,923 39,018
Total comprehensive income (loss) $ (757,240) $ 95,488 $ (7,228,011) $ (234,007)