v3.19.1

Income Taxes - Summary of Changes in Valuation Allowance (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Valuation allowance as of beginning of year	$ 5,677	$ 3,795
Increases recorded to accumulated deficit (adoption of ASU 2016-09)		876
Decreases recorded as a benefit to income tax provision		(1,368)
Increases recorded to tax provision	5,580	2,374
Valuation allowance as of end of year	$ 11,257	$ 5,677

X

- Definition

Amount of increase (decrease) in the valuation allowance recognized as an income tax benefit.

+ References

No definition available.

+ Details

Name:	ever_ValuationAllowanceDeferredTaxAssetChangeInAmountRecognizedAsIncomeTaxBenefit
Namespace Prefix:	ever_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of increase (decrease) in the valuation allowance recognized as an income tax expense.

+ References

No definition available.

+ Details

Name:	ever_ValuationAllowanceDeferredTaxAssetChangeInAmountRecognizedAsIncomeTaxExpense
Namespace Prefix:	ever_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of increase (decrease) in the valuation allowance recorded to accumulated deficit.

+ References

No definition available.

+ Details

Name:	ever_ValuationAllowanceDeferredTaxAssetChangeInAmountRecognizedInAccumulatedDeficit
Namespace Prefix:	ever_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

+ Details

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

X

- References

No definition available.

+ Details

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