XML 74 R57.htm IDEA: XBRL DOCUMENT
v3.22.4

Basis of Presentation, Summary of Significant Accounting Policies and Change in Accounting Principles - Additional Information (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 reporting_unit segment option_to_renew_lease | Dec. 31, 2021
Accounting Policies [Abstract] |  |
Number of operating segments | segment | 2 |
Number of reporting units | reporting_unit | 3 |
Accounts receivable netted against claims payable | 47.00% | 42.00%
Accounts receivable, net eligible for net basis settlement | 14.00% |
Number of leases option | option_to_renew_lease | 1 |

X
- Definition Number Of Options To Renew Leases + References No definition available. + Details
Name: | evh_NumberOfOptionsToRenewLeases
Namespace Prefix: | evh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Right of Offset, Percentage of Accounts Receivable, Net Eligible for Net Basis Settlement + References No definition available. + Details
Name: | evh_RightOfOffsetPercentageOfAccountsReceivableNetEligibleForNetBasisSettlement
Namespace Prefix: | evh_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Right of Offset, Percentage of Accounts Receivable Netted Against Claims Payable + References No definition available. + Details
Name: | evh_RightOfOffsetPercentageOfAccountsReceivableNettedAgainstClaimsPayable
Namespace Prefix: | evh_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 18 -URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8672-108599 + Details
Name: | us-gaap_NumberOfOperatingSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment. + References No definition available. + Details
Name: | us-gaap_NumberOfReportingUnits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration