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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Revenue:      
Collaboration revenue $ 70,353,483ecyt_CollaborationRevenue $ 64,870,919ecyt_CollaborationRevenue $ 34,682,111ecyt_CollaborationRevenue
Total revenue 70,353,483us-gaap_Revenues 64,870,919us-gaap_Revenues 34,682,111us-gaap_Revenues
Operating expenses:      
Research and development 41,649,389us-gaap_ResearchAndDevelopmentExpense 57,898,971us-gaap_ResearchAndDevelopmentExpense 35,670,418us-gaap_ResearchAndDevelopmentExpense
General and administrative 23,677,366us-gaap_GeneralAndAdministrativeExpense 25,313,731us-gaap_GeneralAndAdministrativeExpense 15,054,369us-gaap_GeneralAndAdministrativeExpense
Total operating expenses 65,326,755us-gaap_OperatingExpenses 83,212,702us-gaap_OperatingExpenses 50,724,787us-gaap_OperatingExpenses
Income (loss) from operations 5,026,728us-gaap_OperatingIncomeLoss (18,341,783)us-gaap_OperatingIncomeLoss (16,042,676)us-gaap_OperatingIncomeLoss
Other income (expense), net:      
Interest income 578,636us-gaap_InvestmentIncomeInterest 465,505us-gaap_InvestmentIncomeInterest 327,745us-gaap_InvestmentIncomeInterest
Interest expense (1,189)us-gaap_InterestExpense (2,458)us-gaap_InterestExpense (628,993)us-gaap_InterestExpense
Other income (expense), net (144,698)us-gaap_OtherNonoperatingIncomeExpense (153,702)us-gaap_OtherNonoperatingIncomeExpense (947,834)us-gaap_OtherNonoperatingIncomeExpense
Net income (loss) 5,459,477us-gaap_NetIncomeLoss (18,032,438)us-gaap_NetIncomeLoss (17,291,758)us-gaap_NetIncomeLoss
Net income (loss) per share:      
Basic (in dollars per share) $ 0.14us-gaap_EarningsPerShareBasic $ (0.50)us-gaap_EarningsPerShareBasic $ (0.48)us-gaap_EarningsPerShareBasic
Diluted (in dollars per share) $ 0.13us-gaap_EarningsPerShareDiluted $ (0.50)us-gaap_EarningsPerShareDiluted $ (0.48)us-gaap_EarningsPerShareDiluted
Items included in other comprehensive income (loss):      
Unrealized gain (loss) on foreign currency translation (38,776)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax (6,805)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax 707us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax
Unrealized gain (loss) on available-for-sale securities (161,843)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax (9,253)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax 78,306us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Other comprehensive income (loss) (200,619)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent (16,058)us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 79,013us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income (loss) $ 5,258,858us-gaap_ComprehensiveIncomeNetOfTax $ (18,048,496)us-gaap_ComprehensiveIncomeNetOfTax $ (17,212,745)us-gaap_ComprehensiveIncomeNetOfTax
Weighted-average number of common shares used in net income (loss) per share calculation:      
Basic (in shares) 40,242,352us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 36,036,996us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 35,858,757us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares) 41,758,101us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 36,036,996us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 35,858,757us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding