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Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Income Statement [Abstract]        
Net revenues $ 9,729,047 $ 6,528,575 $ 27,572,459 $ 23,867,795
Costs and expenses:        
Cost of products sold 1,339,723 1,030,943 3,692,256 3,294,411
Selling and marketing 3,821,953 3,410,205 11,365,966 10,626,193
Research and development 934,783 1,440,584 2,622,310 4,276,206
General and administrative 2,158,057 1,958,629 6,195,523 6,389,569
Amortization 485,493 202,982 1,083,706 610,677
Total costs and expenses 8,740,009 8,043,343 24,959,761 25,197,056
Operating income (loss) 989,038 (1,514,768) 2,612,698 (1,329,261)
Interest income 108,005 20,350 204,892 161,709
Interest expense (26,877) (24,286) (51,358) (62,721)
Income (loss) before income taxes 1,070,166 (1,518,704) 2,766,232 (1,230,273)
Income tax (expense) benefit (340,982) 686,209 (1,052,330) 590,250
Net income (loss) 729,184 (832,495) 1,713,902 (640,023)
Net loss at subsidiary attributable to noncontrolling interests 16,736 12,553 40,908 35,772
Net income (loss) attributable to common shareholders 745,920 (819,942) 1,754,810 (604,251)
Earnings (loss) per share attributable to common shareholders        
- basic (in USD per share) $ 0.04 $ (0.04) $ 0.10 $ (0.03)
- diluted (in USD per share) $ 0.04 $ (0.04) $ 0.10 $ (0.03)
Weighted-average shares outstanding        
- basic (in shares) 17,544,905 18,233,407 17,730,715 18,420,465
- diluted (in shares) 17,848,110 18,233,407 17,990,561 18,420,465
Comprehensive income (loss) attributable to common shareholders 745,920 (819,942) 1,754,810 (604,251)
Net loss at subsidiary attributable to noncontrolling interests 16,736 12,553 40,908 35,772
Total comprehensive income (loss) $ 729,184 $ (832,495) $ 1,713,902 $ (640,023)