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Fair Value Measurements (Fair Value Measurements On A Recurring Basis) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents, Carrying amount $ 1,631us-gaap_CashAndCashEquivalentsAtCarryingValue $ 1,190us-gaap_CashAndCashEquivalentsAtCarryingValue $ 1,682us-gaap_CashAndCashEquivalentsAtCarryingValue $ 1,505us-gaap_CashAndCashEquivalentsAtCarryingValue
Treasury Bills, fair value 6,342us-gaap_OtherShortTermInvestments 6,542us-gaap_OtherShortTermInvestments    
Available-for-sale Securities, Fair Value 6,884us-gaap_AvailableForSaleSecurities 7,798us-gaap_AvailableForSaleSecurities    
Obligations [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Contingent Earn-out, Fair Value 472us-gaap_LiabilitiesFairValueDisclosureRecurring
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_ObligationsMember
472us-gaap_LiabilitiesFairValueDisclosureRecurring
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_ObligationsMember
   
Contingent Earn-out, Carrying Value 472else_ContingentEarnOutCarryingValue
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_ObligationsMember
472else_ContingentEarnOutCarryingValue
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_ObligationsMember
   
Fair Value, Inputs, Level 1 [Member] | Obligations [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Contingent Earn-out, Fair Value 0us-gaap_LiabilitiesFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_ObligationsMember
0us-gaap_LiabilitiesFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_ObligationsMember
   
Fair Value, Inputs, Level 2 [Member] | Obligations [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Contingent Earn-out, Fair Value 0us-gaap_LiabilitiesFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_ObligationsMember
0us-gaap_LiabilitiesFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_ObligationsMember
   
Fair Value, Inputs, Level 3 [Member] | Obligations [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Contingent Earn-out, Fair Value 472us-gaap_LiabilitiesFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_ObligationsMember
472us-gaap_LiabilitiesFairValueDisclosureRecurring
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByLiabilityClassAxis
= us-gaap_ObligationsMember
   
Small Cap Technology Sector [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale Securities, Carrying amount 542else_CarryingAmountOfAvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= else_SmallCapTechnologySectorMember
1,256else_CarryingAmountOfAvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= else_SmallCapTechnologySectorMember
   
Available-for-sale Securities, Fair Value 542us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= else_SmallCapTechnologySectorMember
1,256us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= else_SmallCapTechnologySectorMember
   
Small Cap Technology Sector [Member] | Fair Value, Inputs, Level 1 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale Securities, Fair Value 542us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= else_SmallCapTechnologySectorMember
1,256us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= else_SmallCapTechnologySectorMember
   
Small Cap Technology Sector [Member] | Fair Value, Inputs, Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale Securities, Fair Value 0us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= else_SmallCapTechnologySectorMember
0us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= else_SmallCapTechnologySectorMember
   
Small Cap Technology Sector [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale Securities, Fair Value 0us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= else_SmallCapTechnologySectorMember
0us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= else_SmallCapTechnologySectorMember
   
Money Market [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents, Carrying amount 1,336us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MoneyMarketFundsMember
510us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MoneyMarketFundsMember
   
Cash and cash equivalents, Fair Value 1,336us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MoneyMarketFundsMember
510us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MoneyMarketFundsMember
   
Money Market [Member] | Fair Value, Inputs, Level 1 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents, Fair Value 1,336us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MoneyMarketFundsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
510us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MoneyMarketFundsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
   
Money Market [Member] | Fair Value, Inputs, Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents, Fair Value 0us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MoneyMarketFundsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
0us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MoneyMarketFundsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Money Market [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents, Fair Value 0us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MoneyMarketFundsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
0us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_MoneyMarketFundsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
   
Commercial Paper [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents, Carrying amount 146us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CommercialPaperMember
345us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CommercialPaperMember
   
Cash and cash equivalents, Fair Value 146us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CommercialPaperMember
345us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CommercialPaperMember
   
Commercial Paper [Member] | Fair Value, Inputs, Level 1 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents, Fair Value 146us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CommercialPaperMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
345us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CommercialPaperMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
   
Commercial Paper [Member] | Fair Value, Inputs, Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents, Fair Value 0us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CommercialPaperMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
0us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CommercialPaperMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Commercial Paper [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents, Fair Value 0us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CommercialPaperMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
0us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_CommercialPaperMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
   
Treasury Bills [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Treasury Bills, carrying value 6,342else_OtherShortTermInvestmentsCarryingValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USTreasurySecuritiesMember
6,542else_OtherShortTermInvestmentsCarryingValue
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USTreasurySecuritiesMember
   
Treasury Bills, fair value 6,342us-gaap_OtherShortTermInvestments
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USTreasurySecuritiesMember
6,542us-gaap_OtherShortTermInvestments
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USTreasurySecuritiesMember
   
Treasury Bills [Member] | Fair Value, Inputs, Level 1 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Treasury Bills, fair value 6,342us-gaap_OtherShortTermInvestments
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USTreasurySecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
6,542us-gaap_OtherShortTermInvestments
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USTreasurySecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
   
Treasury Bills [Member] | Fair Value, Inputs, Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Treasury Bills, fair value 0us-gaap_OtherShortTermInvestments
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USTreasurySecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
0us-gaap_OtherShortTermInvestments
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USTreasurySecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
   
Treasury Bills [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Treasury Bills, fair value $ 0us-gaap_OtherShortTermInvestments
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USTreasurySecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
$ 0us-gaap_OtherShortTermInvestments
/ us-gaap_FairValueByAssetClassAxis
= us-gaap_USTreasurySecuritiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member