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Balance Sheet Account Detail (Property, Plant and Equipment) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]      
Property and equipment, at cost $ 37,693,000us-gaap_PropertyPlantAndEquipmentGross $ 16,975,000us-gaap_PropertyPlantAndEquipmentGross  
Accumulated depreciation (11,997,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (9,637,000)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment  
Property and equipment, net 25,696,000us-gaap_PropertyPlantAndEquipmentNet 7,338,000us-gaap_PropertyPlantAndEquipmentNet  
Depreciation expense 2,700,000us-gaap_Depreciation 2,100,000us-gaap_Depreciation 1,500,000us-gaap_Depreciation
Production equipment, molds, and office furniture      
Property, Plant and Equipment [Line Items]      
Property and equipment, at cost 12,943,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= elgx_FurnitureAndEquipmentMember
8,033,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= elgx_FurnitureAndEquipmentMember
 
Computer hardware and software      
Property, Plant and Equipment [Line Items]      
Property and equipment, at cost 6,457,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerEquipmentMember
3,290,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ComputerEquipmentMember
 
Leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment, at cost 15,729,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
3,058,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LeaseholdImprovementsMember
 
Construction in progress (software and related implementation, production equipment, and leasehold improvements)      
Property, Plant and Equipment [Line Items]      
Property and equipment, at cost $ 2,564,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
$ 2,594,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember