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Consolidated Statements of Income and Comprehensive Income (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Revenues:      
Net product revenue $ 36,683,762us-gaap_SalesRevenueGoodsNet $ 31,100,698us-gaap_SalesRevenueGoodsNet $ 47,944,031us-gaap_SalesRevenueGoodsNet
Other revenue 218,109us-gaap_OtherSalesRevenueNet 926,764us-gaap_OtherSalesRevenueNet 907,206us-gaap_OtherSalesRevenueNet
Net revenues 36,901,871us-gaap_SalesRevenueNet 32,027,462us-gaap_SalesRevenueNet 48,851,237us-gaap_SalesRevenueNet
Costs and expenses:      
Cost of products sold 5,053,165us-gaap_CostOfGoodsSold 5,439,422us-gaap_CostOfGoodsSold 5,046,179us-gaap_CostOfGoodsSold
Selling and marketing 14,902,202us-gaap_SellingAndMarketingExpense 14,387,745us-gaap_SellingAndMarketingExpense 20,329,493us-gaap_SellingAndMarketingExpense
Research and development 3,389,419us-gaap_ResearchAndDevelopmentExpense 5,615,501us-gaap_ResearchAndDevelopmentExpense 5,095,172us-gaap_ResearchAndDevelopmentExpense
General and administrative 8,401,560us-gaap_GeneralAndAdministrativeExpense 9,489,976us-gaap_GeneralAndAdministrativeExpense 9,055,959us-gaap_GeneralAndAdministrativeExpense
Amortization 1,596,689us-gaap_AmortizationOfIntangibleAssets 896,156us-gaap_AmortizationOfIntangibleAssets 506,332us-gaap_AmortizationOfIntangibleAssets
Total costs and expenses 33,343,035us-gaap_CostsAndExpenses 35,828,800us-gaap_CostsAndExpenses 40,033,135us-gaap_CostsAndExpenses
Operating income (loss) 3,558,836us-gaap_OperatingIncomeLoss (3,801,338)us-gaap_OperatingIncomeLoss 8,818,102us-gaap_OperatingIncomeLoss
Interest income 251,447us-gaap_InvestmentIncomeInterest 230,291us-gaap_InvestmentIncomeInterest 304,865us-gaap_InvestmentIncomeInterest
Interest expense (67,074)us-gaap_InterestExpense (103,422)us-gaap_InterestExpense (71,985)us-gaap_InterestExpense
Income (loss) before income taxes 3,743,209us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments (3,674,469)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 9,050,982us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax (expense) benefit (1,380,744)us-gaap_IncomeTaxExpenseBenefit 1,523,051us-gaap_IncomeTaxExpenseBenefit (3,244,776)us-gaap_IncomeTaxExpenseBenefit
Net income (loss) 2,362,465us-gaap_ProfitLoss (2,151,418)us-gaap_ProfitLoss 5,806,206us-gaap_ProfitLoss
Net loss at subsidiary attributable to noncontrolling interests 61,258us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 46,804us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 36,286us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net income (loss) attributable to common shareholders 2,423,723us-gaap_NetIncomeLoss (2,104,614)us-gaap_NetIncomeLoss 5,842,492us-gaap_NetIncomeLoss
Earnings (loss) per share attributable to common shareholders:      
Basic (in USD per share) $ 0.14us-gaap_EarningsPerShareBasic [1] $ (0.11)us-gaap_EarningsPerShareBasic [1] $ 0.30us-gaap_EarningsPerShareBasic
Diluted (in USD per share) $ 0.14us-gaap_EarningsPerShareDiluted [1] $ (0.11)us-gaap_EarningsPerShareDiluted [1] $ 0.30us-gaap_EarningsPerShareDiluted
Weighted-average common shares outstanding:      
Basic (in shares) 17,617,765us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 18,332,997us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 19,564,625us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares) 17,899,632us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 18,332,997us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 19,787,537us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Comprehensive income (loss) attributable to common shareholders 2,423,723us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest (2,104,614)us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest 5,842,492us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Net loss at subsidiary attributable to noncontrolling interests 61,258us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest 46,804us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest 36,286us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest
Total comprehensive income (loss) $ 2,362,465us-gaap_ComprehensiveIncomeNetOfTax $ (2,151,418)us-gaap_ComprehensiveIncomeNetOfTax $ 5,806,206us-gaap_ComprehensiveIncomeNetOfTax
[1] Due to the nature of interim earnings per share calculations, the sum of the quarterly earnings per share amounts may not equal the reported earnings per share for the full year.