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Condensed Consolidated Statements of Net and Comprehensive Income (Unaudited) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Condensed Consolidated Statements of Net and Comprehensive Income [Abstract]        
Net revenues $ 12,366,940 $ 14,389,741 $ 22,623,152 $ 25,056,668
Costs and expenses:        
Cost of products sold 1,103,005 1,283,160 1,951,555 2,070,098
Selling and marketing 5,491,964 5,904,444 10,472,517 11,193,028
Research and development 1,553,343 1,027,048 2,957,365 2,036,721
General and administrative 2,164,098 2,371,506 4,429,123 4,373,510
Amortization of product license right 114,599 171,726 226,646 343,453
Total costs and expenses 10,427,009 10,757,884 20,037,206 20,016,810
Operating income 1,939,931 3,631,857 2,585,946 5,039,858
Interest income 76,074 52,260 148,355 95,169
Interest expense (16,720) (79,604) (39,147) (295,647)
Income before income tax expense 1,999,285 3,604,513 2,695,154 4,839,380
Income tax expense (263,031) (1,436,365) (545,059) (1,959,949)
Net and comprehensive income 1,736,254 2,168,148 2,150,095 2,879,431
Net loss attributable to noncontrolling interests 8,036 9,471 17,403 19,348
Net income attributable to common shareholders $ 1,744,290 $ 2,177,619 $ 2,167,498 $ 2,898,779
Earnings per share attributable to common shareholders        
- basic $ 0.09 $ 0.11 $ 0.11 $ 0.14
- diluted $ 0.09 $ 0.11 $ 0.11 $ 0.14
Weighted-average shares outstanding        
- basic 19,771,167 20,471,621 19,889,583 20,458,842
- diluted 19,996,805 20,661,719 20,117,246 20,719,714