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Revenue by Geographic Region (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule of Revenue by Geographic Region [Line Items]                      
Revenue $ 38,847us-gaap_SalesRevenueGoodsNet $ 37,150us-gaap_SalesRevenueGoodsNet $ 38,327us-gaap_SalesRevenueGoodsNet $ 33,264us-gaap_SalesRevenueGoodsNet $ 35,249us-gaap_SalesRevenueGoodsNet $ 33,260us-gaap_SalesRevenueGoodsNet $ 33,964us-gaap_SalesRevenueGoodsNet $ 29,784us-gaap_SalesRevenueGoodsNet $ 147,588us-gaap_SalesRevenueGoodsNet $ 132,257us-gaap_SalesRevenueGoodsNet $ 105,946us-gaap_SalesRevenueGoodsNet
Europe                      
Schedule of Revenue by Geographic Region [Line Items]                      
Revenue                 29,131us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember		 16,101us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember		 8,404us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
Latin America                      
Schedule of Revenue by Geographic Region [Line Items]                      
Revenue                 6,509us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_LatinAmericaMember		 6,118us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_LatinAmericaMember		 4,859us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_LatinAmericaMember
Asia/Pacific                      
Schedule of Revenue by Geographic Region [Line Items]                      
Revenue                 5,896us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember		 7,062us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember		 5,591us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember
Canada                      
Schedule of Revenue by Geographic Region [Line Items]                      
Revenue                 0us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= country_CA		 39us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= country_CA		 0us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementGeographicalAxis
= country_CA
Direct | United States                      
Schedule of Revenue by Geographic Region [Line Items]                      
Revenue                 106,052us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= elgx_DirectRevenueMember
/ us-gaap_StatementGeographicalAxis
= country_US		 102,937us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= elgx_DirectRevenueMember
/ us-gaap_StatementGeographicalAxis
= country_US		 87,092us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= elgx_DirectRevenueMember
/ us-gaap_StatementGeographicalAxis
= country_US
Distributor | Total ROW                      
Schedule of Revenue by Geographic Region [Line Items]                      
Revenue                 $ 12,405us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= elgx_DistributorRevenueMember
/ us-gaap_StatementGeographicalAxis
= elgx_TotalRestOfWorldRowMember		 $ 13,219us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= elgx_DistributorRevenueMember
/ us-gaap_StatementGeographicalAxis
= elgx_TotalRestOfWorldRowMember		 $ 10,450us-gaap_SalesRevenueGoodsNet
/ us-gaap_StatementBusinessSegmentsAxis
= elgx_DistributorRevenueMember
/ us-gaap_StatementGeographicalAxis
= elgx_TotalRestOfWorldRowMember
Geographic Concentration Risk | Sales                      
Schedule of Revenue by Geographic Region [Line Items]                      
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		 100.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
Geographic Concentration Risk | Sales | Europe                      
Schedule of Revenue by Geographic Region [Line Items]                      
Concentration Risk, Percentage                 19.70%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember		 12.20%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember		 7.90%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
Geographic Concentration Risk | Sales | Latin America                      
Schedule of Revenue by Geographic Region [Line Items]                      
Concentration Risk, Percentage                 4.40%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_LatinAmericaMember		 4.60%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_LatinAmericaMember		 4.60%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_LatinAmericaMember
Geographic Concentration Risk | Sales | Asia/Pacific                      
Schedule of Revenue by Geographic Region [Line Items]                      
Concentration Risk, Percentage                 4.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember		 5.30%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember		 5.30%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaPacificMember
Geographic Concentration Risk | Sales | Canada                      
Schedule of Revenue by Geographic Region [Line Items]                      
Concentration Risk, Percentage                 0.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_CA		 0.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_CA		 0.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_GeographicConcentrationRiskMember
/ us-gaap_StatementGeographicalAxis
= country_CA
Geographic Concentration Risk | Sales | Direct | United States                      
Schedule of Revenue by Geographic Region [Line Items]                      
Concentration Risk, Percentage                 71.90%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		 77.80%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		 82.20%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 | Distributor | Total ROW                      
Schedule of Revenue by Geographic Region [Line Items]                      
Concentration Risk, Percentage                 8.40%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		 10.00%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		 9.90%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