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Commitments and Contingencies -Additional Information (Detail) $ in Millions	Mar. 31, 2021 USD ($)
Operating Leased Assets [Line Items]
Nonprobable Sales Tax Due	$ 1.5

X

- Definition

The amount of sales tax liability assessed by the state that the company has not recorded a liability for as it is not deemed probable.

+ References

No definition available.

+ Details

Name:	ever_NonprobableSalesTaxDue
Namespace Prefix:	ever_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

Name:	us-gaap_OperatingLeasedAssetsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration