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Condensed Consolidated Statements of Net and Comprehensive Income (Unaudited) (USD $)
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Condensed Consolidated Statements of Net and Comprehensive Income [Abstract]    
Net revenues $ 10,256,212 $ 10,666,927
Costs and expenses:    
Cost of products sold 848,550 786,938
Selling and marketing 4,980,553 5,288,584
Research and development 1,404,022 1,009,673
General and administrative 2,265,025 2,002,004
Amortization of product license right 112,047 171,727
Total costs and expenses 9,610,197 9,258,926
Operating income 646,015 1,408,001
Interest income 72,281 42,909
Interest expense (22,427) (216,043)
Income before income tax expense 695,869 1,234,867
Income tax expense (282,028) (523,584)
Net and comprehensive income 413,841 711,283
Net loss attributable to noncontrolling interests 9,367 9,877
Net income attributable to common shareholders $ 423,208 $ 721,160
Earnings per share attributable to common shareholders    
- Basic $ 0.02 $ 0.04
- Diluted $ 0.02 $ 0.03
Weighted-average shares outstanding    
- Basic 20,007,998 20,445,921
- Diluted 20,234,438 20,777,666