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v3.25.2

Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
Supplemental disclosure of non-cash investing and financing activities |  |
Accrued property and equipment purchases | $ (395) | $ 91
Effects of leases |  |
Operating cash outflows from operating leases | 21,219 | 6,939
Leased assets disposed of (obtained in) exchange for operating lease liabilities | $ 0 | $ 185

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- Definition Capital Expenditures Incurred but Not yet Paid, Accrued Property and Purchases + References No definition available. + Details
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Namespace Prefix: | evh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Cash Flow, Lessee [Abstract] + References No definition available. + Details
Name: | evh_CashFlowLesseeAbstract
Namespace Prefix: | evh_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Operating Lease Payments, Effects Of Leases + References No definition available. + Details
Name: | evh_OperatingLeasePaymentsEffectsOfLeases
Namespace Prefix: | evh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Right-Of-Use Asset Obtained In (Disposed Of) Exchange For Operating Lease Liabilities + References No definition available. + Details
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Namespace Prefix: | evh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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