Fair value measurements - Change in fair value of liabilities (Details)	12 Months Ended
Dec. 31, 2021 USD ($)
Changes in Fair Value of Warrant Liabilities [Roll Forward]
Fair value as of beginning period	$ 0
Liability recognized due to the CRIS Business Combination	35,654,000
Transfer to Level 1	(7,065,000)
Change in fair value of liability	(19,742,000)
Fair value as of ending period	8,847,000
Changes in Fair Value of Earnout Liabilities [Roll Forward]
Fair value as of beginning period	0
Liability recognized due to the CRIS Business Combination	18,278,000
Liability settled through equity	(10,853,000)
Fair Value Adjustment of Earnout Liability	(2,214,000)
Fair value as of ending period	$ 5,211,000

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

Name:	evgo_ChangesInFairValueOfEarnoutLiabilitiesRollForward
Namespace Prefix:	evgo_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

Name:	evgo_ChangesInFairValueOfWarrantLiabilitiesRollForward
Namespace Prefix:	evgo_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of earnout liability recognized during the period from business combination.

+ References

No definition available.

+ Details

Name:	evgo_EarnoutLiabilityRecognizedBusinessCombination
Namespace Prefix:	evgo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of earnout liability settled through Equity.

+ References

No definition available.

+ Details

Name:	evgo_EarnoutLiabilitySettledThroughEquity
Namespace Prefix:	evgo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of expense (income) related to adjustment to fair value of earnout liability.

+ References

No definition available.

+ Details

Name:	evgo_FairValueAdjustmentOfEarnoutLiability
Namespace Prefix:	evgo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of warrant liability recognized during the period from business combination.

+ References

No definition available.

+ Details

Name:	evgo_WarrantLiabilityRecognizedBusinessCombination
Namespace Prefix:	evgo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of warrant liability transferred to level 1.

+ References

No definition available.

+ Details

Name:	evgo_WarrantLiabilityTransferredToLevel1
Namespace Prefix:	evgo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of liability recognized arising from contingent consideration in a business combination, expected to be settled beyond one year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 35
-Paragraph 1
-Subparagraph b
-URI http://asc.fasb.org/extlink&oid=116859824&loc=d3e6819-128478

+ Details

Name:	us-gaap_BusinessCombinationContingentConsiderationLiabilityNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 22
-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313

+ Details

Name:	us-gaap_DerivativeLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of addition (reduction) to the amount at which a liability could be incurred (settled) in a current transaction between willing parties.

+ References

No definition available.

+ Details

Name:	us-gaap_LiabilitiesFairValueAdjustment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration