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Consolidated Statements of Income and Comprehensive Income (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Revenues:      
Net product revenue $ 31,100,698 $ 47,944,031 $ 50,893,794
Other revenue 926,764 907,206 248,982
Net revenues 32,027,462 48,851,237 51,142,776
Costs and expenses:      
Cost of products sold 5,439,422 5,046,179 5,362,554
Selling and marketing 14,387,745 20,329,493 20,940,060
Research and development 5,615,501 5,095,172 5,028,072
General and administrative 9,489,976 9,055,959 9,307,301
Amortization 896,156 506,332 655,302
Total costs and expenses 35,828,800 40,033,135 41,293,289
Operating (loss) income (3,801,338) 8,818,102 9,849,487
Interest income 230,291 304,865 210,727
Interest expense (103,422) (71,985) (353,497)
(Loss) income before income taxes (3,674,469) 9,050,982 9,706,717
Income tax benefit (expense) 1,523,051 (3,244,776) (4,080,204)
Net (loss) income (2,151,418) 5,806,206 5,626,513
Net loss at subsidiary attributable to noncontrolling interests 46,804 36,286 31,343
Net (loss) income attributable to common shareholders (2,104,614) 5,842,492 5,657,856
Earnings (loss) per share attributable to common shareholders:      
Basic (in USD per share) $ (0.11) $ 0.30 $ 0.28
Diluted (in USD per share) $ (0.11) $ 0.30 $ 0.28
Weighted-average common shares outstanding:      
Basic (in shares) 18,332,997 19,564,625 20,342,913
Diluted (in shares) 18,332,997 19,787,537 20,572,132
Comprehensive (loss) income $ (2,151,418) $ 5,806,206 $ 5,626,513