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Condensed Consolidated Statements of Operations and Comprehensive Income (loss) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Income Statement [Abstract]        
Net revenues $ 10,371,918 $ 8,492,530 $ 33,855,265 $ 27,243,859
Costs and expenses:        
Cost of products sold 1,921,875 1,460,463 5,933,807 4,511,743
Selling and marketing 5,562,443 4,803,112 15,836,077 14,549,873
Research and development 1,278,013 1,306,055 4,003,980 4,631,384
General and administrative 2,422,886 2,067,981 7,621,858 6,732,485
Amortization 1,033,786 661,802 3,085,139 1,946,457
Total costs and expenses 12,219,003 10,299,413 36,480,861 32,371,942
Operating income (loss) (1,847,085) (1,806,883) (2,625,596) (5,128,083)
Interest income (50,511) 166,220 195,915 398,420
Interest expense (64,877) (19,199) (216,988) (59,520)
Income (loss) before income taxes (1,962,473) (1,659,862) (2,646,669) (4,789,183)
Income tax (expense) benefit (4,462) (4,159) 72,504 (12,477)
Net income (loss) (1,966,935) (1,664,021) (2,574,165) (4,801,660)
Net (income) loss at subsidiary attributable to noncontrolling interests 13,267 20,977 (2,888) 58,689
Net income (loss) attributable to common shareholders $ (1,953,668) $ (1,643,044) $ (2,577,053) $ (4,742,971)
Earnings (loss) per share attributable to common shareholders        
- basic (in dollars per share) $ (0.13) $ (0.11) $ (0.17) $ (0.30)
- diluted (in dollars per share) $ (0.13) $ (0.11) $ (0.17) $ (0.30)
Weighted-average shares outstanding        
- basic (in shares) 15,368,027 15,573,108 15,454,159 15,645,230
- diluted (in shares) 15,368,027 15,573,108 15,454,159 15,645,230
Comprehensive income (loss) attributable to common shareholders $ (1,953,668) $ (1,643,044) $ (2,577,053) $ (4,742,971)
Net (income) loss at subsidiary attributable to noncontrolling interests 13,267 20,977 (2,888) 58,689
Total comprehensive income (loss) $ (1,966,935) $ (1,664,021) $ (2,574,165) $ (4,801,660)