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Earnout Liability - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended
	Jul. 02, 2021	Jul. 01, 2021	Mar. 31, 2022	Dec. 31, 2021
Earnout shares related to business combination		1,437,500
Change in fair value of earnout liability			$ (2,264)
Earnout liability, at fair value		$ 18,300	$ 7,475	$ 5,211
$12.50 Triggering Event [[Member]
Earnout shares related to business combination	718,750
Earnout triggering share price	$ 12.50
Earnout liability, at fair value	$ 10,900
$15.00 Triggering Event
Earnout shares related to business combination	718,750
Earnout triggering share price	$ 15.00		$ 15.00
Change in fair value of earnout liability			$ 2,300
Earnout liability, at fair value	$ 8,800		$ 7,500	$ 5,200

X

- Definition

Earnout shares related to business combination.

+ References

No definition available.

+ Details

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Namespace Prefix:	evgo_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Earnout triggering share price.

+ References

No definition available.

+ Details

Name:	evgo_EarnoutTriggeringSharePrice
Namespace Prefix:	evgo_
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Balance Type:	na
Period Type:	duration

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- 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

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Period Type:	instant

X

- Details

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Namespace Prefix:
Data Type:	na
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Period Type:

X

- Details

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Namespace Prefix:
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