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Basis of Presentation, Summary of Significant Accounting Policies and Change in Accounting Principles - Right of Offset (Details) | Dec. 31, 2021 | Dec. 31, 2020
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Accounting Policies [Abstract] |  |
Right of offset, percentage of accounts receivable netted against claims payable | 42.00% | 0.00%
Right of offset, percentage of accounts receivable, net eligible for net basis settlement | 55.00% |

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- Definition Right of Offset, Percentage of Accounts Receivable, Net Eligible for Net Basis Settlement + References No definition available. + Details
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- Definition Right of Offset, Percentage of Accounts Receivable Netted Against Claims Payable + References No definition available. + Details
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Namespace Prefix: | evh_
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Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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