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Other Current Assets - Schedule Of Other Current Assets (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2021 Officers
Other Current Asset [Abstract]
Number of officers under insurance contract	2

X

- Definition

Number of officers under insurance contract

+ References

No definition available.

+ Details

Name:	evex_Numberofofficersunderinsurancecontract
Namespace Prefix:	evex_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Other current asset.

+ References

No definition available.

+ Details

Name:	evex_OtherCurrentAssetAbstract
Namespace Prefix:	evex_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration