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Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Income Statement [Abstract]        
Net revenues $ 8,909,741 $ 9,750,168 $ 17,596,515 $ 17,843,412
Costs and expenses:        
Cost of products sold 1,237,001 1,298,816 2,398,842 2,352,533
Selling and marketing 3,505,486 3,930,082 7,036,401 7,544,013
Research and development 828,070 861,154 2,687,082 1,687,527
General and administrative 2,153,562 2,140,249 3,797,703 4,037,466
Amortization 511,691 304,258 998,440 598,213
Total costs and expenses 8,235,810 8,534,559 16,918,468 16,219,752
Operating income 673,931 1,215,609 678,047 1,623,660
Interest income 57,846 29,544 114,248 96,887
Interest expense (18,489) (12,278) (34,039) (24,481)
Income before income taxes 713,288 1,232,875 758,256 1,696,066
Income tax expense (318,990) (523,339) (337,446) (711,348)
Net income 394,298 709,536 420,810 984,718
Net loss at subsidiary attributable to noncontrolling interests 11,700 13,034 31,469 24,172
Net income attributable to common shareholders $ 405,998 $ 722,570 $ 452,279 $ 1,008,890
Earnings per share attributable to common shareholders        
- basic (in USD per share) $ 0.02 $ 0.04 $ 0.03 $ 0.06
- diluted (in USD per share) $ 0.02 $ 0.04 $ 0.03 $ 0.06
Weighted-average shares outstanding        
- basic (in shares) 16,820,725 17,743,395 16,916,193 17,825,174
- diluted (in shares) 17,184,345 18,025,913 17,294,087 18,093,391
Comprehensive income attributable to common shareholders $ 405,998 $ 722,570 $ 452,279 $ 1,008,890
Net loss at subsidiary attributable to noncontrolling interests 11,700 13,034 31,469 24,172
Total comprehensive income $ 394,298 $ 709,536 $ 420,810 $ 984,718