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Consolidated Statements of Income and Comprehensive Income (Loss) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenues:      
Revenues $ 47,533,637 $ 40,741,765 $ 41,150,131
Costs and expenses:      
Cost of products sold 8,752,020 7,378,095 7,370,585
Selling and marketing 21,429,040 20,258,307 21,492,937
Research and development 6,478,592 7,575,892 4,280,385
General and administrative 10,362,433 10,150,777 9,651,350
Amortization 4,134,557 2,769,466 2,436,222
Total costs and expenses 51,156,642 48,132,537 45,231,479
Operating income (loss) (3,623,005) (7,390,772) (4,081,348)
Interest income 243,364 564,484 299,326
Interest expense (246,186) (195,848) (92,904)
Income (loss) before income taxes (3,625,827) (7,022,136) (3,874,926)
Income tax (expense) benefit 79,316 (16,636) (4,174,889)
Net income (loss) (3,546,511) (7,038,772) (8,049,815)
Net loss at subsidiary attributable to noncontrolling interests 8,752 75,704 71,182
Net income (loss) attributable to common shareholders $ (3,537,759) $ (6,963,068) $ (7,978,633)
Earnings (loss) per share attributable to common shareholders:      
Basic (in USD per share) $ (0.23) $ (0.45) $ (0.50)
Diluted (in USD per share) $ (0.23) $ (0.45) $ (0.50)
Weighted-average common shares outstanding:      
Basic (in shares) 15,396,098 15,614,052 15,911,577
Diluted (in shares) 15,396,098 15,614,052 15,911,577
Comprehensive income (loss) attributable to common shareholders $ (3,537,759) $ (6,963,068) $ (7,978,633)
Net loss at subsidiary attributable to noncontrolling interests 8,752 75,704 71,182
Total comprehensive income (loss) (3,546,511) (7,038,772) (8,049,815)
Product      
Revenues:      
Revenues 45,552,587 40,200,832 40,376,563
Other      
Revenues:      
Revenues $ 1,981,050 $ 540,933 $ 773,568