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Income Taxes (Details)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Taxes [Line Items]      
Income tax computed at federal statutory tax rate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
State taxes, net of federal benefit 6.30%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 4.20%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 3.90%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
State taxes rate change, net of federal benefit 30.40%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate
International operations 6.60%us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (2.10%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential (0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential
Research and development credits (22.60%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch 13.80%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch 2.40%us-gaap_EffectiveIncomeTaxRateReconciliationTaxCreditsResearch
Orphan drug credits (57.40%)ecyt_EffectiveIncomeTaxRateReconciliationOrphanDrugCreditsPercent 6.60%ecyt_EffectiveIncomeTaxRateReconciliationOrphanDrugCreditsPercent 0.00%ecyt_EffectiveIncomeTaxRateReconciliationOrphanDrugCreditsPercent
Equity compensation 16.60%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost (2.50%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost (2.20%)us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost
Other (2.10%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (1.30%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (0.20%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Change in valuation allowance (11.80%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (52.70%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance (37.70%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Total 0.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations 0.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations 0.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations