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RELATED PARTY TRANSACTIONS (Details)			1 Months Ended		6 Months Ended
	Jul. 12, 2023 USD ($)	Feb. 20, 2023 USD ($)	May 31, 2023 USD ($)	Sep. 30, 2022 USD ($) Installment	Jun. 30, 2023 USD ($)	Sep. 09, 2022 USD ($)
Related Party Transaction [Abstract]
Notice period for first termination of contract					120 days
License agreement automatic renewal term					2 years 6 months
Percentage of sublicense fees paid before license expiration date		20.00%
Percentage of sublicense fees received during renewal term		30.00%
Minimum [Member]
Related Party Transaction [Abstract]
Sublicense Fees		$ 100,000,000
Subsequent Event [Member]
Related Party Transaction [Abstract]
Monthly installment fees amount	$ 400,000
Percentage of sublicense fees received during renewal term	20.00%
Subsequent Event [Member] | Maximum [Member]
Related Party Transaction [Abstract]
License agreement automatic renewal term	5 years
Subsequent Event [Member] | Minimum [Member]
Related Party Transaction [Abstract]
License agreement automatic renewal term	2 years 6 months
Sublicense Fees	$ 6,000,000
Dr. Fiore [Member]
Related Party Transaction [Abstract]
Monthly installment fees amount			$ 20,000
Notice period for first termination of contract					15 days
Factor Bioscience Inc. [Member]
Related Party Transaction [Abstract]
Master services agreement, initial fees payable				$ 5,000,000
Number of monthly installments for fees payable | Installment				12
Monthly installment fees amount				$ 400,000
Monthly master services agreement fees payable initial 12-month				5,000,000
Initial license fees obligation				3,500,000
Deposit paid to be applied to last month of first work order						$ 400,000
Notice period for first termination of contract					120 days
Notice period for superseding termination provisions					30 days
Agreed waive payment				$ 3,500,000
Remaining unamortized license fee obligation					$ 2,100,000

X

- Definition

The amount agreed to waive payment as per waiver agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	erna_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of deposit paid which will be applied to the last month of the first work order.

+ References

No definition available.

+ Details

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Namespace Prefix:	erna_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of initial license fees required to pay including non-refundable fee.

+ References

No definition available.

+ Details

Name:	erna_InitialLicenseFeeObligation
Namespace Prefix:	erna_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The automatic renewal term of license agreement, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	erna_LicenseAgreementAutomaticRenewalTerm
Namespace Prefix:	erna_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount agreed to pay an initial fee under Master Services Agreement (or "MSA").

+ References

No definition available.

+ Details

Name:	erna_MasterServiceAgreementInitialFeesPayable
Namespace Prefix:	erna_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The monthly master service agreement ("MSA") fees payable to related party.

+ References

No definition available.

+ Details

Name:	erna_MonthlyMasterServicesAgreementFeesPayable
Namespace Prefix:	erna_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The Company may terminate the first work under the MSA on or after the second anniversary of the date of the MSA, subject to providing Factor with prior notice, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	erna_NoticePeriodForFirstTerminationOfContract
Namespace Prefix:	erna_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The Master Services Agreement (or "MSA") contains customary confidentiality provisions and representations and warranties of the parties, and the Master Services Agreement (or "MSA") may be terminated by ether party prior notice, subject to any superseding termination provisions contained in a particular work order, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	erna_NoticePeriodForSupersedingTerminationProvisions
Namespace Prefix:	erna_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of equal monthly installments for initial fees payable.

+ References

No definition available.

+ Details

Name:	erna_NumberOfMonthlyInstallmentsForFeesPayable
Namespace Prefix:	erna_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Company will pay to Factor of sublicense fees paid before license expiration date.

+ References

No definition available.

+ Details

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Namespace Prefix:	erna_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Company will receive remaining 30% sublicense fees during renewal term.

+ References

No definition available.

+ Details

Name:	erna_PercentageOfSublienceFeesReceivedDuringRenewalTerm
Namespace Prefix:	erna_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	erna_RelatedPartyTransactionAbstract
Namespace Prefix:	erna_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of required periodic fees payment.

+ References

No definition available.

+ Details

Name:	erna_RelatedPartyTransactionPeriodicFeesPaymentAmount
Namespace Prefix:	erna_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of remaining unamortized license fee obligation.

+ References

No definition available.

+ Details

Name:	erna_RemainingUnamortizedLicenseFeeObligation
Namespace Prefix:	erna_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Sublicense fees required to pay including non-refundable fee.

+ References

No definition available.

+ Details

Name:	erna_SublicenseFees
Namespace Prefix:	erna_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_TitleOfIndividualAxis=srt_DirectorMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=erna_FactorBioscienceIncMember
Namespace Prefix:
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Balance Type:
Period Type: