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Consolidated Statements of Income and Comprehensive Income (Loss) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Revenues:      
Net product revenue $ 33,013,184 $ 36,683,762 $ 31,100,698
Other revenue 505,867 218,109 926,764
Net revenues 33,519,051 36,901,871 32,027,462
Costs and expenses:      
Cost of products sold 4,968,170 5,053,165 5,439,422
Selling and marketing 13,994,768 14,902,202 14,387,745
Research and development 3,847,651 3,389,419 5,615,501
General and administrative 7,607,588 8,401,560 9,489,976
Amortization 1,989,264 1,596,689 896,156
Total costs and expenses 32,407,441 33,343,035 35,828,800
Operating income (loss) 1,111,610 3,558,836 (3,801,338)
Interest income 209,183 251,447 230,291
Interest expense (73,856) (67,074) (103,422)
Income (loss) before income taxes 1,246,937 3,743,209 (3,674,469)
Income tax (expense) benefit (575,829) (1,380,744) 1,523,051
Net income (loss) 671,108 2,362,465 (2,151,418)
Net loss at subsidiary attributable to noncontrolling interests 60,243 61,258 46,804
Net income (loss) attributable to common shareholders $ 731,351 $ 2,423,723 $ (2,104,614)
Earnings (loss) per share attributable to common shareholders:      
Basic (in USD per share) $ 0.04 $ 0.14 $ (0.11)
Diluted (in USD per share) $ 0.04 $ 0.14 $ (0.11)
Weighted-average common shares outstanding:      
Basic (in shares) 16,715,970 17,617,765 18,332,997
Diluted (in shares) 17,094,754 17,899,632 18,332,997
Comprehensive income (loss) attributable to common shareholders $ 731,351 $ 2,423,723 $ (2,104,614)
Net loss at subsidiary attributable to noncontrolling interests 60,243 61,258 46,804
Total comprehensive income (loss) $ 671,108 $ 2,362,465 $ (2,151,418)