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Long-term Debt - Warrant Agreement (Details) - Class A Common Stock - USD ($) $ / shares in Units, $ in Millions	Jan. 08, 2021	Dec. 30, 2019
Class of Warrant or Right [Line Items]
Warrants agreed to be sold (in shares)		1,513,786
Exercise price of warrants or rights (in dollars per share)		$ 8.05
Period during which warrants or rights exercisable, after maturity of credit agreement		30 days
Payments to settle outstanding warrants	$ 13.7

X

- Definition

Class Of Warrant Or Right, Period During Which Warrants Or Rights Exercisable, After Maturity Of Credit Agreement

+ References

No definition available.

+ Details

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Namespace Prefix:	evh_
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Balance Type:	na
Period Type:	duration

X

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI https://asc.fasb.org/extlink&oid=126973232&loc=d3e21475-112644

+ Details

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Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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X

- Definition

The number of warrants or rights which entitle the entity to receive future services in exchange for the unvested, forfeitable warrants or rights.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 50
-Section S99
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	instant

X

- Definition

The aggregate amount paid by the entity to reacquire the right to purchase equity shares at a predetermined price, usually issued together with corporate debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3291-108585

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Period Type:	duration

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