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Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Net revenues $ 7,081,088 $ 12,366,940 $ 17,339,220 $ 22,623,152
Costs and expenses:        
Cost of products sold 1,154,833 1,103,005 2,263,468 1,951,555
Selling and marketing 3,542,049 5,491,964 7,215,988 10,472,517
Research and development 1,386,904 1,553,343 2,835,622 2,957,365
General and administrative 1,855,201 2,147,518 4,430,940 4,412,543
Amortization 282,645 131,179 407,695 243,226
Total costs and expenses 8,221,632 10,427,009 17,153,713 20,037,206
Operating (loss) income (1,140,544) 1,939,931 185,507 2,585,946
Interest income 48,982 76,074 141,359 148,355
Interest expense (20,700) (16,720) (38,435) (39,147)
(Loss) income before income taxes (1,112,262) 1,999,285 288,431 2,695,154
Income tax benefit (expense) 463,408 (263,031) (95,959) (545,059)
Net (loss) income (648,854) 1,736,254 192,472 2,150,095
Net loss at subsidiary attributable to noncontrolling interests 9,836 8,036 23,219 17,403
Net (loss) income attributable to common shareholders (639,018) 1,744,290 215,691 2,167,498
Earnings (loss) per share attributable to common shareholders        
- basic (in USD per share) $ (0.03) $ 0.09 $ 0.01 $ 0.11
- diluted (in USD per share) $ (0.03) $ 0.09 $ 0.01 $ 0.11
Weighted-average shares outstanding        
- basic (in shares) 18,405,522 19,771,167 18,580,891 19,889,583
- diluted (in shares) 18,405,522 19,996,805 18,756,691 20,117,246
Comprehensive income $ (648,854) $ 1,736,254 $ 192,472 $ 2,150,095