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Balance Sheet Account Detail (Goodwill and Intangible Assets) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Goodwill, Finite-lived, and Indefinite-lived Intangible Assets [Line Items]    
Goodwill $ 28,866us-gaap_Goodwill [1],[2] $ 29,103us-gaap_Goodwill [1],[2]
Intangible assets (excluding goodwill), net 43,465us-gaap_IntangibleAssetsNetExcludingGoodwill 43,096us-gaap_IntangibleAssetsNetExcludingGoodwill
Developed technology    
Goodwill, Finite-lived, and Indefinite-lived Intangible Assets [Line Items]    
Finite lived intangibles 40,100us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= elgx_DevelopedTechnologyMember		 [3] 40,100us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= elgx_DevelopedTechnologyMember		 [3]
Accumulated amortization (285)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= elgx_DevelopedTechnologyMember		 (48)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= elgx_DevelopedTechnologyMember
Finite lived intangibles, net 39,815us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= elgx_DevelopedTechnologyMember		 40,052us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= elgx_DevelopedTechnologyMember
Patent    
Goodwill, Finite-lived, and Indefinite-lived Intangible Assets [Line Items]    
Finite lived intangibles 100us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= elgx_PatentMember		 100us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= elgx_PatentMember
Accumulated amortization (100)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= elgx_PatentMember		 (95)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= elgx_PatentMember
Finite lived intangibles, net 0us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= elgx_PatentMember		 5us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= elgx_PatentMember
License    
Goodwill, Finite-lived, and Indefinite-lived Intangible Assets [Line Items]    
Finite lived intangibles 100us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember		 100us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember
Accumulated amortization (71)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember		 (41)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember
Finite lived intangibles, net 29us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember		 59us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_LicensingAgreementsMember
Customer relationships    
Goodwill, Finite-lived, and Indefinite-lived Intangible Assets [Line Items]    
Finite lived intangibles 480us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		 544us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Accumulated amortization (400)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		 (272)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Finite lived intangibles, net 80us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember		 272us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Acquried Shonin approval    
Goodwill, Finite-lived, and Indefinite-lived Intangible Assets [Line Items]    
Finite lived intangibles 1,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= elgx_IntuitrakShoninMember		 0us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= elgx_IntuitrakShoninMember
Accumulated amortization (167)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= elgx_IntuitrakShoninMember		 0us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= elgx_IntuitrakShoninMember
Finite lived intangibles, net 833us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= elgx_IntuitrakShoninMember		 0us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= elgx_IntuitrakShoninMember
Trademarks and trade names    
Goodwill, Finite-lived, and Indefinite-lived Intangible Assets [Line Items]    
Indefinite lived intangibles $ 2,708us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember		 $ 2,708us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill
/ us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksAndTradeNamesMember
[1] Regulatory approval for Intuitrak in Japan acquired through an amendment with a distributor in the fourth quarter of 2014.
[2] Difference in goodwill value between these dates is solely due to a foreign currency translation adjustment.
[3] Was reclassified in the first quarter of 2013 to finite lived intangibles, which coincided with the European commercial launch of the product (Nellix System) associated with this intangible asset. A significant portion of this intangible asset will not begin amortization until the U.S. launch of this product, currently scheduled for 2016.