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Income Tax Expense (Components of Deferred Tax Assets and Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred:    
Net operating loss carryforwards $ 56,331us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 53,247us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Accrued expenses 4,274us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals 846us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Tax credits 7,368us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 8,590us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Bad debt 72us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 131us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
Inventory 2,121us-gaap_DeferredTaxAssetsInventory 597us-gaap_DeferredTaxAssetsInventory
Capitalized research and development 3,874us-gaap_DeferredTaxAssetsInProcessResearchAndDevelopment 3,740us-gaap_DeferredTaxAssetsInProcessResearchAndDevelopment
Deferred compensation 2,587us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 3,043us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Depreciation and amortization 635us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 0us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Deferred tax asset 77,262elgx_DeferredTaxAssetsLiabilitiesGross 70,194elgx_DeferredTaxAssetsLiabilitiesGross
Valuation allowance (57,883)us-gaap_DeferredTaxAssetsValuationAllowance (49,793)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred tax assets 19,379us-gaap_DeferredTaxAssetsNet 20,401us-gaap_DeferredTaxAssetsNet
Deferred Tax Liabilities, Net [Abstract]    
Depreciation and amortization 0us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment (1,034)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Convertible debt (3,595)us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities (4,116)us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Other (85)us-gaap_DeferredTaxLiabilitiesOther (377)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities (20,258)us-gaap_DeferredIncomeTaxLiabilities (21,536)us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax liability (879)us-gaap_DeferredTaxLiabilities (1,135)us-gaap_DeferredTaxLiabilities
Trademarks and trade names    
Deferred Tax Liabilities, Net [Abstract]    
Intangible assets (1,043)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember		 (1,012)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
Developed Technology and Trademark    
Deferred Tax Liabilities, Net [Abstract]    
Intangible assets $ (15,535)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= elgx_DevelopedTechnologyAndTrademarkMember		 $ (14,997)us-gaap_DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= elgx_DevelopedTechnologyAndTrademarkMember