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Consolidated Statements of Income (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Revenues:      
Net product revenue $ 50,893,794 $ 44,704,570 $ 43,142,350
Other revenue 248,982 1,171,801 394,928
Net revenues 51,142,776 45,876,371 43,537,278
Costs and expenses:      
Cost of products sold 5,362,554 3,586,646 4,136,541
Selling and marketing 20,940,060 22,674,505 20,194,074
Research and development 5,028,072 4,327,485 4,993,278
General and administrative 9,197,955 7,990,222 7,643,070
Amortization 655,302 686,911 686,904
Other 109,346 108,855 106,776
Total costs and expenses 41,293,289 39,374,624 37,760,643
Operating income 9,849,487 6,501,747 5,776,635
Interest income 210,727 200,207 79,363
Interest expense (353,497) (1,423,523) (772,927)
Income before income taxes 9,706,717 5,278,431 5,083,071
Income tax expense (4,080,204) (2,851,420) (2,024,192)
Net income 5,626,513 2,427,011 3,058,879
Net loss at subsidiary attributable to noncontrolling interests 31,343 29,669 32,536
Net income attributable to common shareholders $ 5,657,856 $ 2,456,680 $ 3,091,415
Earnings per share attributable to common shareholders      
- Basic $ 0.28 $ 0.12 $ 0.22
- Diluted $ 0.28 $ 0.12 $ 0.17
Weighted-average shares outstanding      
- Basic 20,342,913 20,333,932 14,199,479
- Diluted 20,572,132 21,058,577 18,234,171