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Balance Sheet Accounts (Schedule of Accounts Receivable) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total accounts receivable $ 8,200us-gaap_AccountsReceivableNetCurrent $ 4,586us-gaap_AccountsReceivableNetCurrent
Accounts receivable - for other revenues [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total accounts receivable 2,462us-gaap_AccountsReceivableNetCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= ehth_AccountsReceivableOtherRevenuesMember
1,995us-gaap_AccountsReceivableNetCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= ehth_AccountsReceivableOtherRevenuesMember
Medicare renewal commissions receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total accounts receivable 355us-gaap_AccountsReceivableNetCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= ehth_MedicareRenewalCommissionsReceivableMember
2,121us-gaap_AccountsReceivableNetCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= ehth_MedicareRenewalCommissionsReceivableMember
Other commissions receivable [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total accounts receivable $ 5,383us-gaap_AccountsReceivableNetCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= ehth_OtherCommissionsReceivableMember
$ 470us-gaap_AccountsReceivableNetCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= ehth_OtherCommissionsReceivableMember