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Condensed Consolidated Statements of Income (Unaudited) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Condensed Consolidated Statements of Income [Abstract]        
Net revenues $ 14,389,741 $ 10,739,935 $ 25,056,668 $ 20,870,587
Costs and expenses:        
Cost of products sold 1,283,160 863,725 2,070,098 1,723,013
Selling and marketing 5,904,444 5,848,123 11,193,028 11,455,635
Research and development 1,027,048 1,034,800 2,036,721 1,808,668
General and administrative 2,344,064 1,782,834 4,324,455 3,664,037
Amortization of product license right 171,726 171,726 343,453 343,452
Other 27,442 28,867 49,055 55,414
Total costs and expenses 10,757,884 9,730,075 20,016,810 19,050,219
Operating income 3,631,857 1,009,860 5,039,858 1,820,368
Interest income 52,260 50,334 95,169 111,013
Interest expense (79,604) (405,956) (295,647) (751,908)
Net income before income taxes 3,604,513 654,238 4,839,380 1,179,473
Income tax expense (1,436,365) (374,461) (1,959,949) (586,198)
Net income 2,168,148 279,777 2,879,431 593,275
Net loss at subsidiary attributable to noncontrolling interests 9,471 7,527 19,348 17,607
Net income attributable to common shareholders $ 2,177,619 $ 287,304 $ 2,898,779 $ 610,882
Earnings per share attributable to common shareholders        
- basic $ 0.11 $ 0.01 $ 0.14 $ 0.03
- diluted $ 0.11 $ 0.01 $ 0.14 $ 0.03
Weighted-average shares outstanding        
- basic 20,471,621 20,445,560 20,458,842 20,340,000
- diluted 20,661,719 21,207,645 20,719,714 21,302,119