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Consolidated Statements of Operations and Comprehensive Income (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Product revenue $ 75,473,998us-gaap_SalesRevenueGoodsNet $ 71,773,730us-gaap_SalesRevenueGoodsNet $ 68,010,169us-gaap_SalesRevenueGoodsNet
Licensing, milestone and contract revenue 30,120,841us-gaap_SalesRevenueServicesNet 3,307,424us-gaap_SalesRevenueServicesNet 3,348,336us-gaap_SalesRevenueServicesNet
Total revenue 105,594,839us-gaap_SalesRevenueNet 75,081,154us-gaap_SalesRevenueNet 71,358,505us-gaap_SalesRevenueNet
Operating expenses:      
Cost of product revenue 20,930,318us-gaap_CostOfGoodsSold 22,765,404us-gaap_CostOfGoodsSold 28,988,621us-gaap_CostOfGoodsSold
Research & development 8,144,152us-gaap_ResearchAndDevelopmentExpense 7,059,875us-gaap_ResearchAndDevelopmentExpense 5,388,036us-gaap_ResearchAndDevelopmentExpense
Selling, general & administrative 15,073,485us-gaap_SellingGeneralAndAdministrativeExpense 12,936,001us-gaap_SellingGeneralAndAdministrativeExpense 14,728,662us-gaap_SellingGeneralAndAdministrativeExpense
Restructuring charges (credits)   (286,843)us-gaap_RestructuringCharges 2,537,988us-gaap_RestructuringCharges
Total operating expenses 44,147,955us-gaap_CostsAndExpenses 42,474,437us-gaap_CostsAndExpenses 51,643,307us-gaap_CostsAndExpenses
Income from operations 61,446,884us-gaap_OperatingIncomeLoss 32,606,717us-gaap_OperatingIncomeLoss 19,715,198us-gaap_OperatingIncomeLoss
Interest income (expense), net 58,137us-gaap_InterestIncomeExpenseNonoperatingNet (127,186)us-gaap_InterestIncomeExpenseNonoperatingNet (187,777)us-gaap_InterestIncomeExpenseNonoperatingNet
Income before income taxes 61,505,021us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 32,479,531us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 19,527,421us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Provision for income taxes 23,185,542us-gaap_IncomeTaxExpenseBenefit 11,905,010us-gaap_IncomeTaxExpenseBenefit 7,769,961us-gaap_IncomeTaxExpenseBenefit
Net income 38,319,479us-gaap_NetIncomeLoss 20,574,521us-gaap_NetIncomeLoss 11,757,460us-gaap_NetIncomeLoss
Foreign currency translation adjustment (2,795,705)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax 955,535us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax 412,551us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Basic net income per share:      
Net income (in Dollars per share) $ 2.61us-gaap_EarningsPerShareBasic $ 1.46us-gaap_EarningsPerShareBasic $ 0.89us-gaap_EarningsPerShareBasic
Basic weighted average common shares outstanding (in Shares) 14,678,240us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 14,086,912us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 13,260,739us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted net income per share:      
Net income (in Dollars per share) $ 2.51us-gaap_EarningsPerShareDiluted $ 1.39us-gaap_EarningsPerShareDiluted $ 0.82us-gaap_EarningsPerShareDiluted
Diluted weighted average common shares outstanding (in Shares) 15,269,435us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 14,825,599us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 14,344,577us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income 38,319,479us-gaap_NetIncomeLoss 20,574,521us-gaap_NetIncomeLoss 11,757,460us-gaap_NetIncomeLoss
Foreign currency translation adjustment (2,795,705)us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax 955,535us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax 412,551us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax
Comprehensive income $ 35,523,774us-gaap_ComprehensiveIncomeNetOfTax $ 21,530,056us-gaap_ComprehensiveIncomeNetOfTax $ 12,170,011us-gaap_ComprehensiveIncomeNetOfTax