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Revenue by Geographic Region (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Schedule of Revenue by Geographic Region [Line Items]    
Revenue $ 36,671us-gaap_SalesRevenueGoodsNet $ 33,264us-gaap_SalesRevenueGoodsNet
Geographic Concentration Risk | Sales    
Schedule of Revenue by Geographic Region [Line Items]    
Revenue 36,671us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember		 33,264us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
Concentration risk percentage 100.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember		 100.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
Geographic Concentration Risk | Sales | United States | Direct    
Schedule of Revenue by Geographic Region [Line Items]    
Revenue 25,134us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementBusinessSegmentsAxis
= elgx_DirectRevenueMember
/ us-gaap_StatementGeographicalAxis
= country_US		 23,988us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementBusinessSegmentsAxis
= elgx_DirectRevenueMember
/ us-gaap_StatementGeographicalAxis
= country_US
Concentration risk percentage 68.50%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementBusinessSegmentsAxis
= elgx_DirectRevenueMember
/ us-gaap_StatementGeographicalAxis
= country_US		 72.10%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementBusinessSegmentsAxis
= elgx_DirectRevenueMember
/ us-gaap_StatementGeographicalAxis
= country_US
Geographic Concentration Risk | Sales | Europe    
Schedule of Revenue by Geographic Region [Line Items]    
Revenue 7,246us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= exch_ICAP		 6,585us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= exch_ICAP
Concentration risk percentage 19.80%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= exch_ICAP		 19.80%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= exch_ICAP
Geographic Concentration Risk | Sales | Latin America | Distributor    
Schedule of Revenue by Geographic Region [Line Items]    
Revenue 2,039us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementBusinessSegmentsAxis
= elgx_DistributorRevenueMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_LatinAmericaDestinationMember		 918us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementBusinessSegmentsAxis
= elgx_DistributorRevenueMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_LatinAmericaDestinationMember
Concentration risk percentage 5.60%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementBusinessSegmentsAxis
= elgx_DistributorRevenueMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_LatinAmericaDestinationMember		 2.80%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementBusinessSegmentsAxis
= elgx_DistributorRevenueMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_LatinAmericaDestinationMember
Geographic Concentration Risk | Sales | Asia/Pacific | Distributor    
Schedule of Revenue by Geographic Region [Line Items]    
Revenue 2,252us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementBusinessSegmentsAxis
= elgx_DistributorRevenueMember
/ us-gaap_StatementGeographicalAxis
= exch_XPST		 1,773us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementBusinessSegmentsAxis
= elgx_DistributorRevenueMember
/ us-gaap_StatementGeographicalAxis
= exch_XPST
Concentration risk percentage 6.10%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementBusinessSegmentsAxis
= elgx_DistributorRevenueMember
/ us-gaap_StatementGeographicalAxis
= exch_XPST		 5.30%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementBusinessSegmentsAxis
= elgx_DistributorRevenueMember
/ us-gaap_StatementGeographicalAxis
= exch_XPST
Geographic Concentration Risk | Sales | Total ROW | Distributor    
Schedule of Revenue by Geographic Region [Line Items]    
Revenue $ 4,291us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementBusinessSegmentsAxis
= elgx_DistributorRevenueMember
/ us-gaap_StatementGeographicalAxis
= elgx_TotalRestOfWorldRowMember		 $ 2,691us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementBusinessSegmentsAxis
= elgx_DistributorRevenueMember
/ us-gaap_StatementGeographicalAxis
= elgx_TotalRestOfWorldRowMember
Concentration risk percentage 11.70%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementBusinessSegmentsAxis
= elgx_DistributorRevenueMember
/ us-gaap_StatementGeographicalAxis
= elgx_TotalRestOfWorldRowMember		 8.10%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementBusinessSegmentsAxis
= elgx_DistributorRevenueMember
/ us-gaap_StatementGeographicalAxis
= elgx_TotalRestOfWorldRowMember