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Consolidated Statements of Income and Comprehensive Income (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Revenues: |  |  |
Net product revenue | $ 31,100,698 | $ 47,944,031 | $ 50,893,794
Other revenue | 926,764 | 907,206 | 248,982
Net revenues | 32,027,462 | 48,851,237 | 51,142,776
Costs and expenses: |  |  |
Cost of products sold | 5,439,422 | 5,046,179 | 5,362,554
Selling and marketing | 14,387,745 | 20,329,493 | 20,940,060
Research and development | 5,615,501 | 5,095,172 | 5,028,072
General and administrative | 9,489,976 | 9,055,959 | 9,307,301
Amortization | 896,156 | 506,332 | 655,302
Total costs and expenses | 35,828,800 | 40,033,135 | 41,293,289
Operating (loss) income | (3,801,338) | 8,818,102 | 9,849,487
Interest income | 230,291 | 304,865 | 210,727
Interest expense | (103,422) | (71,985) | (353,497)
(Loss) income before income taxes | (3,674,469) | 9,050,982 | 9,706,717
Income tax benefit (expense) | 1,523,051 | (3,244,776) | (4,080,204)
Net (loss) income | (2,151,418) | 5,806,206 | 5,626,513
Net loss at subsidiary attributable to noncontrolling interests | 46,804 | 36,286 | 31,343
Net (loss) income attributable to common shareholders | (2,104,614) | 5,842,492 | 5,657,856
Earnings (loss) per share attributable to common shareholders: |  |  |
Basic (in USD per share) | $ (0.11) | $ 0.30 | $ 0.28
Diluted (in USD per share) | $ (0.11) | $ 0.30 | $ 0.28
Weighted-average common shares outstanding: |  |  |
Basic (in shares) | 18,332,997 | 19,564,625 | 20,342,913
Diluted (in shares) | 18,332,997 | 19,787,537 | 20,572,132
Comprehensive (loss) income | $ (2,151,418) | $ 5,806,206 | $ 5,626,513

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