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Balance Sheet Account Detail (Amortization) (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Balance Sheet Related Disclosures [Abstract]    
Amortization expense $ 400,000us-gaap_AmortizationOfIntangibleAssets $ 100,000us-gaap_AmortizationOfIntangibleAssets
Remainder of 2015 931,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear  
2016 948,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2017 2,210,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2018 3,689,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
2019 4,744,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
2020 5,409,000elgx_FiniteLivedIntangibleAssetsAmortizationExpenseYearSix  
2021 & Thereafter 22,428,000elgx_FiniteLivedIntangibleAssetsAmortizationExpenseYearSevenAndThereafter  
Total $ 40,359,000us-gaap_FiniteLivedIntangibleAssetsNet