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Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Income Statement [Abstract]        
Net revenues $ 9,750,168 $ 7,081,088 $ 17,843,412 $ 17,339,220
Costs and expenses:        
Cost of products sold 1,298,816 1,154,833 2,352,533 2,263,468
Selling and marketing 3,930,082 3,542,049 7,544,013 7,215,988
Research and development 861,154 1,386,904 1,687,527 2,835,622
General and administrative 2,140,249 1,855,201 4,037,466 4,430,940
Amortization 304,258 282,645 598,213 407,695
Total costs and expenses 8,534,559 8,221,632 16,219,752 17,153,713
Operating income (loss) 1,215,609 (1,140,544) 1,623,660 185,507
Interest income 29,544 48,982 96,887 141,359
Interest expense (12,278) (20,700) (24,481) (38,435)
Income (loss) before income taxes 1,232,875 (1,112,262) 1,696,066 288,431
Income tax (expense) benefit (523,339) 463,408 (711,348) (95,959)
Net income (loss) 709,536 (648,854) 984,718 192,472
Net loss at subsidiary attributable to noncontrolling interests 13,034 9,836 24,172 23,219
Net income (loss) attributable to common shareholders 722,570 (639,018) 1,008,890 215,691
Earnings (loss) per share attributable to common shareholders        
- basic (in USD per share) $ 0.04 $ (0.03) $ 0.06 $ 0.01
- diluted (in USD per share) $ 0.04 $ (0.03) $ 0.06 $ 0.01
Weighted-average shares outstanding        
- basic (in shares) 17,743,395 18,405,522 17,825,174 18,580,891
- diluted (in shares) 18,025,913 18,405,522 18,093,391 18,756,691
Comprehensive income (loss) $ 709,536 $ (648,854) $ 984,718 $ 192,472