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Income Tax Expense (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operating Loss Carryforwards [Line Items]      
U.S. Federal statutory rate to net income (loss) before taxes 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate    
Deferred tax assets, valuation allowance $ 57,883,000us-gaap_DeferredTaxAssetsValuationAllowance $ 49,793,000us-gaap_DeferredTaxAssetsValuationAllowance  
Change in valuation allowance 8,100,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount    
Net change in valuation allowance, recorded as tax expense 8,930,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 2,417,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 2,244,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Deferred tax asset related to compensation benefits as well as Federal and State net operating loss carryforwards 9,700,000elgx_DeferredTaxAssetTaxDeferredExpenseCompensationAndBenefitsAndFederalAndStateNetOperatingLossCarryforwards    
Undistributed earnings of foreign subsidiaries 77,000us-gaap_UndistributedEarningsOfForeignSubsidiaries    
Internal Revenue Service (IRS)      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards, domestic 143,600,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember		    
Internal Revenue Service (IRS) | Research Tax Credit Carryforward      
Operating Loss Carryforwards [Line Items]      
Tax credit carryforward amount 7,000,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_ResearchMember		    
State and Local Jurisdiction      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards, state and local 103,700,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		    
State and Local Jurisdiction | Research Tax Credit Carryforward      
Operating Loss Carryforwards [Line Items]      
Tax credit carryforward amount 7,500,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_ResearchMember		    
Income Tax Expense (Benefit)      
Operating Loss Carryforwards [Line Items]      
Net change in valuation allowance, recorded as tax expense $ 8,900,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
/ us-gaap_IncomeStatementLocationAxis
= elgx_IncomeTaxExpenseBenefitMember