Name:	erhe_ConversionPeriodOneToConvertNotes
Namespace Prefix:	erhe_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

This line item represents the conversion period three to convert notes at the option of holder, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	erhe_ConversionPeriodThreeToConvertNotes
Namespace Prefix:	erhe_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

This line item represents the conversion period two to convert notes at the option of holder, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	erhe_ConversionPeriodTwoToConvertNotes
Namespace Prefix:	erhe_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

This line item represents the increasing percentage of event of default occurred.

No definition available.

Name:	erhe_IncreasingPercentageOfEventOfDefaultOccurred
Namespace Prefix:	erhe_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

This line item represents the increasing percentage of redemption of notes.

No definition available.

Name:	erhe_IncreasingPercentageOfRedemptionOfNotes
Namespace Prefix:	erhe_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

This line item represents the initial percentage of event of default occurred.

No definition available.

Name:	erhe_InitialPercentageOfEventOfDefaultOccurred
Namespace Prefix:	erhe_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

This line item represents the initial percentage of redemption of notes.

No definition available.

Name:	erhe_InitialPercentageOfRedemptionOfNotes
Namespace Prefix:	erhe_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

This line item represents the maximum percentage of event of default occurred.

No definition available.

Name:	erhe_MaximumPercentageOfEventOfDefaultOccurred
Namespace Prefix:	erhe_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

This line item represents the maximum percentage of redemption of notes.

No definition available.

Name:	erhe_MaximumPercentageOfRedemptionOfNotes
Namespace Prefix:	erhe_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

This line item represents the Multiplier of conversion price to convert notes.

No definition available.

Name:	erhe_MultiplierOfConversionPriceToConvertNotesMaximum
Namespace Prefix:	erhe_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

This line item represents the multiplier of higher of the projected reset price or stock price to calculate warrant exercise price

No definition available.

Name:	erhe_MultiplierOfHigherOfProjectedResetPriceOrStockPriceToCalculateWarrantExercisePrice
Namespace Prefix:	erhe_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

This line item represents the percentage of conversion of notes which is specified on the market price.

No definition available.

Name:	erhe_PercentageOfConversionOfNotesSpecifiedOnMarketPrice
Namespace Prefix:	erhe_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

This line item represents the percentage of projected volatility curve for each valuation period.

No definition available.

Name:	erhe_PercentageOfProjectedVolatilityCurve
Namespace Prefix:	erhe_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

This line item represents the warrant exercise price one.

No definition available.

Name:	erhe_WarrantExercisePriceOne
Namespace Prefix:	erhe_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

This line item represents the warrant exercise price three.

No definition available.

Name:	erhe_WarrantExercisePriceThree
Namespace Prefix:	erhe_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

This line item represents the warrant exercise price two.

No definition available.

Name:	erhe_WarrantExercisePriceTwo
Namespace Prefix:	erhe_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13495-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

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

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.

No definition available.

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

Decrease in the fair value of the embedded derivative or group of embedded derivatives included in earnings in the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624171-113959

Name:	us-gaap_EmbeddedDerivativeLossOnEmbeddedDerivative
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585

Name:	us-gaap_UnrealizedGainLossOnDerivatives
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Name:	us-gaap_DerivativeByNatureAxis=us-gaap_ConvertibleDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: