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Consolidated Statements of Income and Comprehensive Income (Loss) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenues:      
Revenues $ 40,741,765 $ 41,150,131 $ 33,025,560
Costs and expenses:      
Cost of products sold 7,378,095 7,370,585 5,958,660
Selling and marketing 20,258,307 21,492,937 14,553,481
Research and development 7,320,797 3,901,365 3,190,700
General and administrative 10,405,872 10,030,370 8,561,811
Amortization 2,769,466 2,436,222 2,194,039
Total costs and expenses 48,132,537 45,231,479 34,458,691
Operating income (loss) (7,390,772) (4,081,348) (1,433,131)
Interest income 564,484 299,326 204,661
Interest expense (195,848) (92,904) (106,392)
Income (loss) before income taxes (7,022,136) (3,874,926) (1,334,862)
Income tax (expense) benefit (16,636) (4,174,889) 330,924
Net income (loss) (7,038,772) (8,049,815) (1,003,938)
Net loss at subsidiary attributable to noncontrolling interests 75,704 71,182 59,255
Net income (loss) attributable to common shareholders $ (6,963,068) $ (7,978,633) $ (944,683)
Earnings (loss) per share attributable to common shareholders:      
Basic (in USD per share) $ (0.45) $ (0.50) $ (0.06)
Diluted (in USD per share) $ (0.45) $ (0.50) $ (0.06)
Weighted-average common shares outstanding:      
Basic (in shares) 15,614,052 15,911,577 16,236,525
Diluted (in shares) 15,614,052 15,911,577 16,236,525
Comprehensive income (loss) attributable to common shareholders $ (6,963,068) $ (7,978,633) $ (944,683)
Net loss at subsidiary attributable to noncontrolling interests 75,704 71,182 59,255
Total comprehensive income (loss) (7,038,772) (8,049,815) (1,003,938)
Product      
Revenues:      
Revenues 40,200,832 40,376,563 32,478,185
Other      
Revenues:      
Revenues $ 540,933 $ 773,568 $ 547,375