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Consolidated Statements of Income and Comprehensive Income (Loss) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenues:      
Net product revenue $ 32,478,185 $ 33,013,184 $ 36,683,762
Other revenue 547,375 505,867 218,109
Net revenues 33,025,560 33,519,051 36,901,871
Costs and expenses:      
Cost of products sold 5,958,660 4,968,170 5,053,165
Selling and marketing 14,553,481 13,994,768 14,902,202
Research and development 3,190,700 3,847,651 3,389,419
General and administrative 8,561,811 7,607,588 8,401,560
Amortization 2,194,039 1,989,264 1,596,689
Total costs and expenses 34,458,691 32,407,441 33,343,035
Operating income (loss) (1,433,131) 1,111,610 3,558,836
Interest income 204,661 209,183 251,447
Interest expense (106,392) (73,856) (67,074)
Income (loss) before income taxes (1,334,862) 1,246,937 3,743,209
Income tax (expense) benefit 330,924 (575,829) (1,380,744)
Net income (loss) (1,003,938) 671,108 2,362,465
Net loss at subsidiary attributable to noncontrolling interests 59,255 60,243 61,258
Net income (loss) attributable to common shareholders $ (944,683) $ 731,351 $ 2,423,723
Earnings (loss) per share attributable to common shareholders:      
Basic (in USD per share) $ (0.06) $ 0.04 $ 0.14
Diluted (in USD per share) $ (0.06) $ 0.04 $ 0.14
Weighted-average common shares outstanding:      
Basic (in shares) 16,236,525 16,715,970 17,617,765
Diluted (in shares) 16,236,525 17,094,754 17,899,632
Comprehensive income (loss) attributable to common shareholders $ (944,683) $ 731,351 $ 2,423,723
Net loss at subsidiary attributable to noncontrolling interests 59,255 60,243 61,258
Total comprehensive income (loss) $ (1,003,938) $ 671,108 $ 2,362,465