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Consolidated Statements of Income and Comprehensive Income (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Revenues:      
Net product revenue $ 47,944,031 $ 50,893,794 $ 44,704,570
Other revenue 907,206 248,982 1,171,801
Net revenues 48,851,237 51,142,776 45,876,371
Costs and expenses:      
Cost of products sold 5,046,179 5,362,554 3,586,646
Selling and marketing 20,329,493 20,940,060 22,674,505
Research and development 5,095,172 5,028,072 4,327,485
General and administrative 9,096,165 9,307,301 8,099,077
Amortization 466,126 655,302 686,911
Total costs and expenses 40,033,135 41,293,289 39,374,624
Operating income 8,818,102 9,849,487 6,501,747
Interest income 304,865 210,727 200,207
Interest expense (71,985) (353,497) (1,423,523)
Income before income taxes 9,050,982 9,706,717 5,278,431
Income tax expense (3,244,776) (4,080,204) (2,851,420)
Net income 5,806,206 5,626,513 2,427,011
Net loss at subsidiary attributable to noncontrolling interests 36,286 31,343 29,669
Net income attributable to common shareholders 5,842,492 5,657,856 2,456,680
Earnings per share attributable to common shareholders:      
Basic (in USD per share) $ 0.30 $ 0.28 $ 0.12
Diluted (in USD per share) $ 0.30 $ 0.28 $ 0.12
Weighted-average common shares outstanding:      
Basic (in shares) 19,564,625 20,342,913 20,333,932
Diluted (in shares) 19,787,537 20,572,132 21,058,577
Comprehensive income $ 5,806,206 $ 5,626,513 $ 2,427,011