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v3.21.1

Subsequent Event (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended
--- | --- | ---
Apr. 30, 2021 | Mar. 31, 2020
Subsequent Event [Line Items] |  |
Sale of stock, shares issued (in shares) |  | 2,100,000
Sale of stock, price per share (in dollars per share) |  | $ 115.00
Net proceeds from sale of stock |  | $ 228.0
Subsequent Event |  |
Subsequent Event [Line Items] |  |
Sale of stock, shares issued (in shares) | 2,250,000 |
Preferred Stock, par value (in dollars per share) | $ 0.001 |
Gross proceeds from sale of stock | $ 225.0 |
Sale of stock, price per share (in dollars per share) | $ 100 |
Net proceeds from sale of stock | $ 216.2 |

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- Definition Sale Of Stock, Consideration Received On Transaction, Gross + References No definition available. + Details
Name: | ehth_SaleOfStockConsiderationReceivedOnTransactionGross
Namespace Prefix: | ehth_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_PreferredStockParOrStatedValuePerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition Cash received on stock transaction after deduction of issuance costs. + References No definition available. + Details
Name: | us-gaap_SaleOfStockConsiderationReceivedOnTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The number of shares issued or sold by the subsidiary or equity method investee per stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction. + References No definition available. + Details
Name: | us-gaap_SaleOfStockPricePerShare
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |