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Condensed Consolidated Statements of Net and Comprehensive Income (Unaudited) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Condensed Consolidated Statements of Net and Comprehensive Income [Abstract]        
Net revenues $ 12,531,719 $ 13,054,278 $ 35,154,871 $ 38,110,946
Costs and expenses:        
Cost of products sold 921,862 1,341,256 2,873,417 3,411,354
Selling and marketing 4,914,551 5,060,546 15,387,068 16,253,574
Research and development 1,696,592 1,233,025 4,653,957 3,269,746
General and administrative 1,901,986 2,149,364 6,331,109 6,522,874
Amortization of product license right 117,565 171,727 344,211 515,180
Total costs and expenses 9,552,556 9,955,918 29,589,762 29,972,728
Operating income 2,979,163 3,098,360 5,565,109 8,138,218
Interest income 107,719 52,459 256,074 147,628
Interest expense (17,222) (33,390) (56,369) (329,037)
Income before income taxes 3,069,660 3,117,429 5,764,814 7,956,809
Income tax expense (1,207,504) (1,278,472) (1,752,563) (3,238,421)
Net income 1,862,156 1,838,957 4,012,251 4,718,388
Net loss at subsidiary attributable to noncontrolling interests 7,338 8,455 24,741 27,803
Net income attributable to common shareholders $ 1,869,494 $ 1,847,412 $ 4,036,992 $ 4,746,191
Earnings per share attributable to common shareholders        
- basic $ 0.10 $ 0.09 $ 0.20 $ 0.23
- diluted $ 0.10 $ 0.09 $ 0.20 $ 0.23
Weighted-average shares outstanding        
- basic 19,432,715 20,327,537 19,737,216 20,414,593
- diluted 19,670,741 20,534,647 19,969,051 20,657,567