XML 37 R26.htm IDEA: XBRL DOCUMENT
v3.21.1

Summary of Significant Accounting Policies - Summary of Revenue by Distribution Chanel (Detail) - Sales Revenue, Net [Member] | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Product Information [Line Items] |  |
Revenue from Contract with Customer Percentage | 100.00% | 100.00%
Direct channels [Member] |  |
Product Information [Line Items] |  |
Revenue from Contract with Customer Percentage | 90.00% | 93.00%
Indirect channels [Member] |  |
Product Information [Line Items] |  |
Revenue from Contract with Customer Percentage | 10.00% | 7.00%

X
- Definition Amount of revenue from satisfaction of performance obligation by transferring promised good or service to customer, as a percentage of total revenue. + References No definition available. + Details
Name: | ever_RevenueFromContractWithCustomerPercentage
Namespace Prefix: | ever_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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_ProductInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_SalesRevenueNetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=ever_DirectChannelsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConcentrationRiskByTypeAxis=ever_IndirectChannelsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |